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Block 4 > Anatomy > Flashcards

Anatomy Flashcards

1
Q

Name proximal and distal attachment, action, and innervation of

STERNOCLEIDOMASTOID muscle

A

proximal attachment: mastoid process

**distal attachment: **manubrium of sternum, clavicle

**action: **bilateral contraction: flex cervical spine, unilateral contraction: laterally flex and rotate cervical spine

**innervation: **CN XI

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2
Q

Name proximal and distal attachment, action, and innervation of

ANTERIOR ABDOMINAL WALL muscles

A

proximal attachment: linea alba

**distal attachment: **thoracolumbar fascia

**action: **bilateral contraction: flex spine, unilateral contraction: laterally flex and rotate spine

**innervation: **thoracic ventral rami of spinal nerves

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3
Q

Name proximal and distal attachment, action, and innervation of

PSOAS muscle

A

proximal attachment: T12-L5 vertebral bodies and intervertebral disks

distal attachment: lesser trochanter of femur

action: flex spine (when attachment to femur is fixed)

innervation: L1-3 ventral rami of spinal nerves

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4
Q

Name proximal and distal attachment, action, and innervation of

QUADRATUS LUMBORUM muscle

A

proximal attachment: L5 vertebra, iliac crest

distal attachment: L1-L4 vertebrae, rib 12

action: bilateral contraction: extend spine, unilateral contraction: laterally flex spine

innervation: T12-L4 ventral rami of spinal nerves

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5
Q

Name proximal and distal attachment, action, and innervation of

SPLENIUS muscle

A

proximal attachment: C7-T3 spinous processes

distal attachment: mastoid process, occipital bone, C1-3 vertebrae

action: bilateral contraction: extend cervical and thoracic spine, unilateral contraction: laterally flex and rotate cervical spine

innervation: dorsal rami of spinal nerves

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6
Q

Name proximal and distal attachment, action, and innervation of

ERECTOR SPINAE muscles

A

proximal attachment: sacrum, spinous processes of lower vertebrae, iliac crest

distal attachment: 3 columns of muscles (iliocostalis, longissimus, spinalis) that insert on neural arches of vertebrae to the occiput

action: bilateral contraction: extend spine, unilateral contraction: laterally flex spine with some rotation

innervation: dorsal rami of spinal nerves

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7
Q

Name proximal and distal attachment, action, and innervation of

TRANSVERSOSPINAL muscles

A

proximal attachment: generalized C4-T12 transverse processes

distal attachment:

  • semispinalis: extends to spinous processes across 4-6 spinal segments
  • multifidus: extends to spinous processes across 2-4 spinal segments
  • rotators: extend to spinous processes of adjacent spinal segments

action: extension and rotation of spine

innervation: dorsal rami of spinal nerves

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8
Q

Name proximal and distal attachment, action, and innervation of

SCALENE muscles

A

proximal attachment:

  • anterior: C3-C6 transverse processes
  • middle and posterior: C5-C7 transverse processes

distal attachment:

  • anterior and middle: 1st rib
  • posterior: 2nd rib

action: bilateral: flex cervical spine, unilateral: laterally rotate cervical spine

innervation: C3-C7 ventral rami of spinal nerves

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9
Q

Name proximal and distal attachment, action, and innervation of

LONGUS COLLI muscles

A

proximal attachment: C1-C6 vertebral bodies, transverse processes, and occiput

distal attachment: C3-T3 vertebral bodies and transverse processes

action: flex cervical spine

innervation: C1-C6 ventral rami of spinal nerves

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10
Q

Name proximal and distal attachment, action, and innervation of

PECTORALIS MAJOR muscle

A

proximal attachment: sternum, costal cartilages 1-6, clavicle

distal attachment: intertubercular (bicipital) groove of humerus

action: adducts and medially rotates the humerus; clavicular head (acting alone): flexes humerus; sternocostal head (acting alone): extends humerus from flexed position

innervation: lateral pectoral nerve, medial pectoral nerve

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11
Q

Name proximal and distal attachment, action, and innervation of

PECTORALIS MINOR muscle

A

proximal attachment: ribs 3-5

distal attachment: coracoid process of scapula

action: stabilizes and protracts scapula

innervation: medial pectoral nerve

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12
Q

Name proximal and distal attachment, action, and innervation of

SERRATUS ANTERIOR muscle

A

proximal attachment: ribs 1-9, outer surface

distal attachment: medial border of scapula

action: protracts scapula, raises ribs when scapula is fixed, stabilizes scapula

innervation: long thoracic nerve (C5-C7)

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13
Q

Name proximal and distal attachment, action, and innervation of

TERES MINOR muscle

A

proximal attachment: lateral border of scapula

distal attachment: greater tubercle of humerus

action: laterally rotates arm

innervation: axillary nerve

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14
Q

Name proximal and distal attachment, action, and innervation of

LATISSIMUS DORSI muscle

A

proximal attachment: posterior part of iliac crest, thoracolumbar fascia, T6-T12 spinous processes, ribs 3-4

distal attachment: intertubercular (bicipital) groove of humerus

action: at scapulothoracic joint: depress scapula, at shoulder joint: adduct, internally rotate (humerus), extend

innervation: thoracodorsal nerve

*partially overlapped by trapezius muscle

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15
Q

Name proximal and distal attachment, action, and innervation of

TRICEPS BRACHII muscle

A

proximal attachment:

  • long head: infraglenoid tubercle of scapula
  • lateral head: upper half of posterior shaft of humerus above spiral groove
  • medial head: lower half of posterior shaft of humerus below spiral groove

distal attachment: olecranon process of ulna

action: at shoulder joint: extend (long head), at elbow joint: extend

innervation: radial nerve

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16
Q

Name proximal and distal attachment, action, and innervation of

BICEPS BRACHII muscle

A

proximal attachment:

  • long head: supraglenoid tubercle of scapula
  • short head: coracoid process of scapula

distal attachment: radial tuberosity, bicipital aponeurosis

action: at elbow joint: flex, at shoulder joint: flex (long joint), at radioulnar joint: supinate

innervation: musculocutaneous nerve

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17
Q

Name proximal and distal attachment, action, and innervation of

CORACOBRACHIALIS muscle

A

proximal attachment: coracoid process of scapula

distal attachment: medial shaft of humerus

action: at shoulder joint: flex, adduct

innervation: musculocutaneous nerve

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18
Q

Name proximal and distal attachment, action, and innervation of

PRONATOR TERES muscle

A

proximal attachment: medial epicondyle of humerus, coronoid process of ulna

distal attachment: lateral surface of radius

action: at radioulnar joints: pronate

innervation: median nerve

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19
Q

Name proximal and distal attachment, action, and innervation of

FLEXOR CARPI RADIALIS muscle

A

proximal attachment: medial epicondyle of humerus

distal attachment: base of 2nd and 3rd metacarpal

action: at wrist joint: flex, abduct

innervation: median nerve

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20
Q

Name proximal and distal attachment, action, and innervation of

PALMARIS LONGUS muscle

A

proximal attachment: medial epicondyle of humerus

distal attachment: flexor retinaculum and palmar aponeurosis

action: at wrist joint: flex (weak), tense palmar fascia

innervation: median nerve

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21
Q

Name proximal and distal attachment, action, and innervation of

FLEXOR CARPI ULNARIS muscle

A

proximal attachment: humeral head: medial epicondyle of humerus, ulnar head: olecranon process of ulna

distal attachment: pisiform bone; by ligaments to hook of the hamate and 5th metacarpal bone

action: at wrist joint: flex, adduct

innervation: ulnar nerve

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22
Q

Name proximal and distal attachment, action, and innervation of

EXTENSOR CARPI RADIALIS BREVIS muscle

A

proximal attachment: lateral epicondyle of humerus

distal attachment: base of 2nd and 3rd metacarpals (dorsal side)

action: at wrist joint: extend

innervation: radial nerve

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23
Q

Name proximal and distal attachment, action, and innervation of

EXTENSOR DIGITORUM muscle

A

proximal attachment: lateral epicondyle of humerus

distal attachment: extensor hood of fingers

action: at MCP joints of fingers: extend (NOTE: extend DIP/PIP joints through extensor hood)

innervation: radial nerve

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24
Q

Name proximal and distal attachment, action, and innervation of

EXTENSOR DIGITI MINIMI muscle

A

proximal attachment: lateral epicondyle of humerus

distal attachment: extensor hood of little finger

action: at MCP joint of little finger: extend (NOTE: extend DIP/PIP joints of little finger through extensor hood)

innervation: radial nerve

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25
Q

Name proximal and distal attachment, action, and innervation of

EXTENSOR CARPI ULNARIS muscle

A

proximal attachment: lateral epicondyle of humerus

distal attachment: base of 5th metacarpal (dorsal side)

action: at wrist joint: extend, adduct

innervation: radial nerve

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26
Q

Name origin and insertion, action, and innervation of

TRAPEZIUS muscle

A

origin: occipital bone, ligamentum nuchae, C7-T12 vertebrae

insertion: clavicle, acromion and spine of scapula

action:

  • superior fibers elevate scapula
  • middle fibers retract scapula
  • inferior fibers depress scapulae
  • superior and inferior fibers together cause upward or superior rotation of scapula

innervation: CN XI

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27
Q

Name origin and insertion, action, and innervation of

RHOMBOIDEUS MAJOR/MINOR muscle

A

origin: ligamentum nuchae, C7-T5 vertebrae

insertion: scapula - medial border (from spine to inferior angle)

action: retracts, inferiorly rotates, and stabilizes scapula

innervation: dorsal scapular nerve

*deep to trapezius muscle, inferior to levator scapulae

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28
Q

Name origin and insertion, action, and innervation of

LEVATOR SCAPULAE muscle

A

origin: C1-C4 vertebrae

insertion: scapula - superomedial border

action: elevates and inferiorly rotates scapula

innervation: dorsal scapular nerve

*deep to trapezius muscle, superior to rhomboideus major/minor

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29
Q

SUPERFICIAL BACK MUSCLES

A

Considered extrinsic “back” muscle (extrinsic muscles of the shoulder - posterior group). Connect the upper limbs to the trunk and control limb mvts. Innervated by ventral rami nerves (primarily from the brachial plexus).

  • trapezius
  • latissimus dorsi
  • rhomboideus major/minor
  • levator scapulae
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30
Q

INTERMEDIATE BACK MUSCLES

A

Considered extrinsic “back” muscles, function as accessory respiratory muscles. Innervated by ventral rami nerves.

  • serratus posterior superior
  • serratus posterior inferior
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31
Q

DEEP or TRUE BACK MUSCLES

A

Considered the intrinsic muscles of the back (act on vertebral column). Lie deep to extrinsic muscles and arranged into 3 layers: superficial, intermediate, and deep. Innervated by dorsal rami, collectively called the “paraspinals” clinically.

  • superficial: splenius (capitis, cervicis)
  • intermediate: erector spinae (iliocostalis, longissimus, spinalis)
  • deep: transversospinalis (semispinalis - capitis, cervicis; multifidus; rotatores; interspinous and intertransverse muscles)
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32
Q

THORACOLUMBAR FASCIA

A
  • dense connective tissue that surrounds and covers the deep (intrinsic) back muscles
  • posterior aspect covers superficial layer of intrinsic back muscles
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33
Q

Types and number of vertebrae

A
  • 7 cervical
  • 12 thoracic
  • 5 lumbar
  • 5 sacral (fused into 1 bone)
  • 4 coccygeal
  • TOTAL: 33 bones
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34
Q

Curvatures of the vertebral column

A
  • primary: present at birth (concave opening anteriorly), persist in thoracic and sacrococcygeal regions
  • secondary: develop after birth in cervical and lumbar region
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35
Q

Movements of the vertebral column

A
  • flexion: greatest in cervical region
  • extension: greatest in lumbar region
  • lateral bending: greatest in lumbar region
  • rotation: greatest in thoracic region
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36
Q

Label

Parts of typical vertebra

A
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37
Q

Cervical, thoracic, and lumbar vertebra differences

A
  • cervical: have bifid spinous process, transverse foramen (for vertebral artery)
  • thoracic: have costal and demifacets (for ribs) and inferiorly oriented spinous processes
  • lumbar: lack costal facets, have quadrangular and horizontally oriented spinous processes
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38
Q

Atypical vertebrae - Atlas, Axis

A
  • atlas (C1): articulates superiorly with occipital bone, NO body or spinous process (instead has anterior and posterior arch, facet for dens). Atlanto-occipital joint allows for head flexion and extension.
  • axis (C2): has an odontoid process (dens) around which the atlas rotates. Median atlanto-axial joint allows for rotation of head.
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39
Q

Atypical vertebrae - Sacrum

A

Fusion of S1-S5 vertebrae. Consists of body of S1, ala, promontory, anterior sacral foramina (transmits ventral rami of S1-S5 spinal nerves), posterior sacral foramina (dorsal rami of S1-S5), sacral canal, sacral hiatus*

***Caudal anesthesia may be administered through the sacral hiatus. The solutions pass superiorly in the loose connective tissue and bathe the spinal nerves as they emerge from the dural sheath. OBs use this method of nerve block to relieve labor pain (1st and 2nd stage). This does not affec the infant.

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40
Q

Locating the L4 spinous process

A

A horizontal line drawn across the iliac crests will intersect the L4 spinous process.

***important landmark in doing lumbar punctures to sample CSF

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41
Q

Zygapophyseal (facet) joints

A
  • Synovial joints formed between articular processes of adjacent vertebrae
  • permit gliding movements between vertebrae
  • stabilized by ligaments uniting laminae, transverse and spinous processes
  • innervated by dorsal rami nerves
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42
Q

Intervertebral discs

A
  • Cartilaginous joints (specifically symphyses) between adjacent vertebral bodies designed for weight bearing and strength
  • Composed of outer, tough anulus fibrosus (strength) and inner, gelatinous nucleus pulposus (shock absorption during weight bearing)
  • ***major role in development of curvatures of vertebral column
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43
Q

Synovial joints

A
  • “diarthroses” - highly moveable joints
  • consist of: fibrous joint capsule (encloses joint cavity), synovial membrane (lines inside of fibrous capsule), synovial fluid (secreted by synovial membrane), hyaline cartilage (caps the ends of articulating bones)
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44
Q

Anatomical classification of joints

A
  1. Cartilaginous joints - symphyses, synchondroses
  2. Fibrous joints - syndesmoses, gomphoses, sutures
  3. Synovial joints - hinge type, pivot type, condyloid, saddle type, ball and socket, gliding (plane type)
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45
Q

Functional classification of joints

A
  1. Immoveable joints (synarthroses) - sutures, gomphoses, synchondroses, schindylesis
  2. Slightly moveable joints (amphiarthroses) - symphysis, syndesmoses
  3. Highly moveable joints (diarthroses) - hinge type, pivot type, condyloid, saddle type, ball and socket, gliding
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46
Q

Cartilaginous joints

A
  • formed by 2 bones separated by cartilage of some type
  • 2 types: symphyses (midline of body, e.g. intervertebral discs), synchondroses
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47
Q

Intervertebral (neural) foramen

A

formed when 2 vertebrae come together

transmits spinal nerves

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48
Q

Vertebral (spinal) canal

A
  • formed by articulation of vertebral foramen of adjacent vertebrae
  • transmits spinal cord
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49
Q

Label and name the function of

Vertebral column ligaments

A
  • Anterior longitudinal ligament: prevents hyperextension of vertebral column
  • Posterior longitudinal ligament: prevents hyperflexion
  • Supraspinous and interspinous ligaments: stabilize vertebral column
  • Ligamentum flavum: unites laminae of adjacent vertebrae, elastic nature preserves curvatures of vertebral column
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50
Q

Meninges

A
  • Formed by 3 membranes (superficial to deep): dura mater, arachnoid mater, pia mater
  • Covers spinal cord
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51
Q

Meningeal spaces

A
  • epidural space: space superficial to dura mater
  • subdural space: space between dura mater and arachnoid mater
  • subarachnoid space: space between arachnoid mater and pia mater, contains CSF that cushions spinal cord
  • ***hematomas can occur in subdural and epidural spaces
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52
Q

Denticulate ligament

A
  • Serrated, tooth-like ligament extending between the dorsal and ventral roots
  • Formed by pia mater
  • Helps anchor spinal cord within dural sac
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53
Q

Spinal cord segmentation

A

A spinal cord segment is a section of spinal cord that gives rise to a pair of spinal nerves (dorsal and ventral rami nerves) on each side. A dermatome is a strip of skin that is innervated by sensory fibers from a single spinal cord segment.

  • 8 cervical
  • 12 thoracic
  • 5 lumbar
  • 5 sacral
  • 1 coccygeal
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54
Q

Dorsal and ventral roots of spinal nerves

A

Sensory fibers coming into the spinal cord form a dorsal root. Along the dorsal root is a dorsal root ganglion (DRG) which contains sensory cell bodies.

Motor fibers leaving the spinal cord form a ventral root (the cell bodies for these motor fibers are within the ventral horn of gray matter within the spinal cord).

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55
Q

Spinal nerves

A

There are 31 pairs of spinal nerves. A dorsal and ventral root fuse to form a short spinal nerve.

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56
Q

Dorsal and ventral rami nerves

A

Each spinal nerve quickly divides into two main branches (branches = “rami” in latin): a dorsal ramus nerve and a ventral ramus nerve.

The dorsal rami nerves innervate the intrinsic or deep/true back muscles on the posterior 1/3 of the body wall (soma) circumference.

The ventral rami nerves innervate the antero-lateral 2/3rds of the body wall circumference.

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57
Q

Spinal cord vs. Vertebral column length

A

The spinal cord is MUCH SHORTER than the vertebral column. The spinal cord ends opposite L2.

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58
Q

Nerve roots and vertebrae relationship

A

In the cervical region the spinal nerves emerge (in the intervertebral foramen) ABOVE their corresponding vertebra.

However, because there are only 7 cervical vertebra, the C8 spinal nerve emerges BELOW the C7 vertebra.

From T1 down, the spinal nerves emerge BELOW their corresponding vertebra.

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59
Q

Filum terminale

A

ligament-like structure that eventually anchors to coccyx along with dura and arachnoid mater, forming the coccygeal ligament

helps provide stability for the spinal cord

***dural sac and subarachnoid space end opposite S2

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60
Q

Conus medullaris and cauda equina

A

As the spinal cord ends, it tapers down to form a cone-like structure called the conus medullaris (which ends at L2 vertebral level).

Surrounding it are dorsal and ventral roots that are proceeding inferiorly. These roots look like a “horse’s tail” and so we call it the cauda equina.

Extending from the conus medullaris and traveling through the cauda equina is the filum terminale.

***Remember, the dural sac (and subarachnoid space with CSF) ends at the S2 vertebral level, but the filum terminale continues inferiorly to anchor to the coccyx.

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61
Q

Blood supply of the spinal cord

A
  • 1 anterior spinal artery
  • 2 posterior spinal arteries (from vertebral arteries)
  • radicular arteries from segmental spinal arteries (from posterior intercostal arteries)
  • drained by 3 anterior and 3 posterior spinal veins -> form internal vertebral venous plexus (Batson’s plexus)
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62
Q

Internal vertebral venous plexus (Batson’s plexus)

A

formed by veins draining spinal cord and vertebrae

network of valveless veins that is continuous with cranial dural venous sinuses within skull -> provides pathway for infection between head and lower parts of body!

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63
Q

CNS

A

brain - 12 pairs of cranial nerves

spinal cord - 31 pairs of spinal nerves

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64
Q

Identify

Osteology: anterior view

A
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65
Q

Identify

Osteology: lateral view

A
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66
Q

Identify

Osteology: lateral view

A
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67
Q

Cutaneous innervation of the face

A
  • V1 (ophthalmic): supraorbital nerve
    • also supratrochlear, infratrochlear, lacrimal, external nasal
  • V2 (maxillary): infraorbital nerve
    • also zygomaticotemporal, zygomaticofacial
  • V3 (mandibular): mental nerve
    • also auriculotemporal, buccal
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68
Q

Cutaneous innervation of the scalp

A
  • V1: supraorbital nerve
  • V2: zygomaticotemporal nerve
  • V3: auriculotemporal nerve
  • C2, C3: lesser occipital nerve
  • C2: greater occipital nerve

***C1 has NO cutaneous branch to head and neck. Thus dermatomal pattern comprised only of V1-3, C2-4

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69
Q

Muscles of facial expression: superior and orbital group

A

Occipitofrontalis: frontalis part elevates eyebrows, occipitalis part tenses galea aponeurotica/epicranial aponeurosis

Orbicularis oculi: closes eyelids

Corrugator supercilli: draws eyebrows medial and downwards

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70
Q

Muscles of facial expression: nasal group

A

Procerus: draws down medial angle of eyebrows producing transverse wrinkles over bridge of nose

Nasalis: compresses nasal aperture and laterally opens nostrils

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71
Q

Muscles of facial expression: oral group

A

Buccinator: compression of the cheek, positioning food between teeth

Depressor anguli oris: draws corner of mouth inferiorly and laterally

Zygomaticus major: draws corner of mouth superiorly and laterally

Zygomaticus minor: draws upper lip upward

Orbicularis oris: closure of mouth, protrusion of lips

Mentalis: raises and protrudes lower lip as it wrinkles skin of chin

Risorius: retracts corner of mouth

Depressor labii inferioris: draws lower lip downward and laterally

(Platysma: depresses lower jaw, tenses skin of neck)

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72
Q

Facial nerve motor branches to muscles of facial expression

A
  • temporal: to temporal region
  • zygomatic: to zygomatic region
  • buccal: to cheek or buccal region
  • mandibular: to margin of mandible area
  • cervical: to anterior neck region
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73
Q

Functional components of nerves - Somatic afferent

A
  • somatic sensory fibers from skin, striated skeletal muscle, joints of the soma
  • convey info from pain, temp, touch, proprioception
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74
Q

Functional components of nerves - Somatic efferent

A
  • somatic motor fibers to striated skeletal muscle of the soma
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75
Q

Functional components of nerves - Visceral afferent

A
  • visceral sensory fibers from glands, blood vessels, smooth muscle, cardiac muscle
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76
Q

Functional components of nerves - Visceral efferent

A
  • visceral motor fibers to glands, smooth muscle, cardiac muscle
  • aka autonomic nervous system
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77
Q

Functional components of nerves - Special sense

A
  • sensory fibers from the 5 senses: nose (smelling), eyes (sight), ears (hearing and balance), tongue (taste)
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78
Q

Functional components of nerves - Branchial motor

A
  • motor fibers to striated, skeletal muscle of the head and neck which has developed embryologically from the branchial/pharyngeal arches (NOT from somites)
  • muscles innervated include muscles of facial expression, mastication, and pharynx/larynx
    *
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79
Q

Name the cranial nerve, muscle, and cartilage/bony derivatives of

Branchial arch 1

A
  • CN V (trigeminal)
  • muscles of mastication, mylohyoid, anterior belly of digastric, tensor vili palatini, tensor tympani
  • malleus, incus, mandible
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80
Q

Name the cranial nerve, muscle, and cartilage/bony derivatives of

Branchial arch 2

A
  • CN VII (facial)
  • muscles of facial expression, posterior belly of digastric, stylohyoid, stapedius
  • stapes, styloid, part of hyoid
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81
Q

Name the cranial nerve, muscle, and cartilage/bony derivatives of

Branchial arch 3

A
  • CN IX (glossopharyngeal)
  • stylopharyngeus
  • part of hyoid
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82
Q

Name the cranial nerve, muscle, and cartilage/bony derivatives of

Branchial arches 4 & 6

A
  • CN X (vagus)
  • muscles of pharynx, larynx, palate
  • larynx
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83
Q

Axial skeleton

A

bones of:

the head (skull)

neck (hyoid bone and cervical vertebrae)

trunk (ribs, sternum, vertebrae, sacrum)

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84
Q

Appendicular skeleton

A

bones of the limbs (extremities, appendages), including those forming the pectoral (shoulder) and pelvic girdles

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85
Q

Glenohumeral joint

The tendon of which muscle passes through this joint?

A
  • synovial joint (ball and socket)
  • allows for flexion, extension, abduction, adduction, medial and lateral rotation, circumduction of humerus
  • innervated by: suprascapular, lateral pectoral, axillary nerves
  • **high mobility of this joint results in poor stability and joint is often dislocated

The tendon of the long head of the biceps muscle passes through this joint. It is held in the bicipital groove by the transverse humeral ligament.

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86
Q

Foramen of Weitbrecht

A

weakness in joint capsule between superior and middle glenohumeral ligaments

**head of the humerus penetrates through this weak area in an anterior dislocation of the shoulder!

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87
Q

How is the glenohumeral joint reinforced?

A

reinforced by rotator cuff tendons, anteriorly by glenohumeral ligaments (thickenings of the joint capsule)

The tendon of the long head of the biceps invaginates the joint capsule but does not enter the synovial cavity (intracapsular and extrasynovial)

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88
Q

Glenoid labrum

A

fibrocartilagenous ring that surrounds the glenoid fossa and helps deepen the socket of the shoulder joint

**the fibrous joint capsule attaches directly to the labrum, so any injury of the joint capsule can potentially involve the labrum!

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89
Q

Sternoclavicular (SC) joint

A
  • synovial joint (saddle-type, but functions like a ball and socket)
  • joint separated into 2 separate joint cavities by an articular disk
  • very mobile to allow movements of the pectoral girdle (clavicle + scapula)
  • it is the ONLY joint between the pectoral girdle and axial skeleton
  • innervated by: supraclavicular nerves, nerve to subclavius muscle
  • **very strong joint -> dislocation is rare
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90
Q

Acromioclavicular (AC) joint

A
  • synovial joint (plane type - allows gliding movements)
  • protected by strong superior and inferior acromioclavicular ligaments (also coracoacromial and coracoclavicular ligaments)
  • innervated by: supraclavicular, lateral pectoral, and axillary nerves
  • **this is the joint involved in shoulder separation injuries!
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91
Q

Suprahumeral joint

A
  • not a true joint! refers to the space between the head of the humerus and the acromion and coracoacromial ligament
  • space contains: biceps long head tendon, rotator cuff tendons, subacromial/subdeltoid bursa, glenohumeral joint capsule
    • **thus inflammation of suprahumeral joint can impinge these structures -> possible frozen shoulder syndrome
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92
Q

Extrinsic muscles of the shoulder - anterior group

A
  • pectoralis major
  • pectoralis minor
  • subclavius
  • serratus anterior
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93
Q

Extrinsic muscles of the shoulder - posterior group

A

same as superficial “back” muscles:

  • trapezius
  • levator scapulae
  • rhomboids
  • latissimus dorsi
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94
Q

Movements of the scapula and muscles responsible

A
  • elevation: trapezius (superior fibers), levator scapulae
  • depression: trapezius (inferior fibers)
  • retraction: trapezius (middle fibers), rhomboids
  • protraction: serratus anterior
  • superior (upward) rotation: trapezius (superior and inferior fibers), serratus anterior
  • inferior (downward) rotation: levator scapulae, rhomboids
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95
Q

Name proximal and distal attachment, action, and innervation of

SUBCLAVIUS muscle

A

proximal attachment: 1st rib and its costal cartilage

distal attachment: clavicle (inferior surface)

**action: **draws clavicle inferiorly and anteriorly, protects structures deep to clavicle

**innervation: **nerve to subclavius

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96
Q

Scapulohumeral rhythm

A

integrated movement of the scapula and humerus together

  • involved in movement of upper limb to place hand in functional position
  • for every 2 degrees of abduction at the glenohumeral joint, there is 1 degree of scapular rotation!
  • e.g. abduction of arm 90 degrees - requires simultaneous movement of humerus at glenohumeral joint (60 degrees) accompanied by rotation of scapula (30 degrees).
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97
Q

Intrinsic muscles of the shoulder

A
  • deltoid
  • teres major
  • supraspinatus
  • infraspinatus
  • teres minor
  • subscapularis
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98
Q

Name proximal and distal attachment, action, and innervation of

SUPRASPINATUS muscle

A

proximal attachment: scapula (supraspinous fossa)

**distal attachment: **humerus (greater tubercle)

**action: **initiates abduction, laterally (externally) rotates humerus

**innervation: **suprascapular nerve

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99
Q

Name proximal and distal attachment, action, and innervation of

INFRASPINATUS muscle

A

proximal attachment: scapula (infraspinous fossa)

**distal attachment: **humerus (greater tubercle)

**action: **laterally rotates arm

**innervation: **suprascapular nerve

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100
Q

Rotator cuff

A
  • the cuff is actually the conjoined tendon of the 4 rotator cuff muscles around the fibrous joint capsule of the humerus
  • function: reinforces shoulder joint on all sides (exc inferiorly -> thus weak here)
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101
Q

Critical zone (of the rotator cuff)

A
  • area of vascular anastomoses within the rotator cuff
    • alternately ischemic or hyperemic depending on whether there is tension on the cuff
  • **often the site of degeneration, Ca++ deposits, and tears
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102
Q

Scapular anastomosis

A
  • consists of:
    • branches of the 1st part of the subclavian artery: transverse cervical artery, suprascapular artery, dorsal scapular artery
    • branches of the 3rd part of the axillary artery: subscapular artery and its branches
    • intercostal arteries
  • demonstrates principle of collateral circulation - permits blood to bypass occlusion and still get to its destination
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103
Q

A fracture of the surgical “neck” of the humerus will endanger what structures coursing through the quadrangular space?

A

posterior circumflex humeral artery

axillary nerve

(quadrangular space bordered by triceps lateral head and long head, teres major and minor muscles)

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104
Q

Brachial plexus

A

somatic plexus formed by ventral rami of C5-T1 spinal nerves (or spinal cord segments)

provides sensory and motor innervation to upper limb (pectoral region, shoulder region, arm, forearm, hand) and all pectoral girdle muscles, except the trapezius

divided into 2 parts: supraclavicular (in posterior neck), infraclavicular (in axilla)

consists of 5 roots, 3 trunks, 6 divisions, 3 cords, 5 terminal branches

105
Q

ID the five regions of the brachial plexus and their components

A

5 roots: C5-T1 ventral rami

3 trunks: upper (superior), middle, lower (inferior)

6 divisions: anterior (innervate flexor muscles via musculocutaneous, median, ulnar nerves) and posterior (innervate extensor muscles via radial nerve)

3 cords: lateral, posterior, medial

5 terminal branches: axillary, radial, musculocutaneous, ulnar, median nerves

106
Q

5 terminal branches of the brachial plexus, the spinal cord segments they represent, and their motor innervation

A

axillary nerve (C5-C6): deltoid, teres minor

musculocutaneous nerve (C5-C7): muscles of the anterior (flexor) compartment of the arm - biceps, brachialis, coracobrachialis

median nerve (C5-T1): muscles of the anterior (flexor) compartment of the forearm (exc 1 1/2 muscles) and muscles in 1 1/2 compartments of the hand [pronate forearm, flex wrist and fingers, move thumb]

ulnar nerve (C8-T1): 1 1/2 muscles in flexor compartment of forearm and most of the muscles in the hand [flex wrist and move fingers]

radial nerve (C5-T1): muscles of the posterior (extensor) compartment of arm and forearm [extension at the shoulder, elbow, wrist]

107
Q

Non-terminal branches of the brachial plexus and their innervation

A
  • roots:
    • long thoracic nerve - serratus anterior
    • dorsal scapular nerve - levator scapulae, rhomboids
  • upper trunk:
    • suprascapular nerve - supraspinatus, infraspinatus
    • nerve to subclavius - subclavius
  • medial cord:
    • medial pectoral nerve - pec. major and minor
    • medial brachial cutaneous nerve - sensory to medial side of arm
    • medial antebrachial cutaneous nerve - sensory to medial side of forearm
  • lateral cord:
    • lateral pectoral nerve - pec. major
  • posterior cord:
    • upper subscapular nerve - subscapularis
    • thoracodorsal nerve - lat. dorsi
    • lower subscapular nerve - subscapularis, teres major
108
Q

Boundaries of the axilla

A
  • apex
  • medial wall - lateral bony thorax, serratus anterior
  • anterior wall - pec major and minor, subclavius, clavicle
  • lateral wall - bicipital (intertubercular) groove of humerus
  • posterior wall - scapular, subscapularis, teres major, latissimus dorsi
  • base - skin and superficial fascia
109
Q

Contents of the axilla

A
  • vessels: axillary artery and vein
  • lymph nodes: axillary lymph nodes (lymph from upper limb and 75% from breast)
  • muscles and tendons: biceps long head tendon, biceps short head tendon, coracobrachialis
  • brachial plexus: infraclavicular portion (cords and terminal branches)
110
Q

Axillary artery, parts, and branches

A
  • originates from subclavian artery at 1st rib and ends at inferior border of teres major to become brachial artery
  • divided into 3 parts by pec minor:
    • medial - supreme thoracic artery
    • deep - thoracoacromial artery, lateral thoracic artery
    • lateral - anterior circumflex humeral artery, posterior circumflex humeral artery, subscapular artery
111
Q

Boundaries of the posterior triangle of the neck

A

SCM (posterior portion), trapezius (anterior portion), and clavicle

112
Q

Roof of the posterior triangle of the neck

A
  • formed by the investing fascia of the cervical fascia
  • contains cutaneous branches of the cervical plexus:
    • transverse cervical nerve (C2, C3)
    • great auricular nerve (C2, C3)
    • lesser occipital nerve (C2)
    • supraclavicular nerves (C3, C4)
113
Q

Muscular floor of the posterior triangle of the neck

A
  • splenius capitis
  • levator scapulae
  • posterior scalene
  • middle scalene
  • anterior scalene
114
Q

Brachial plexus in posterior triangle of neck

A

supraclavicular brachial plexus (roots and trunks)

  • between anterior and middle scalene muscles, superior to subclavian artery, courses over 1st rib
115
Q

What nerve controlling respiration courses through the posterior triangle? What muscle does it control, and what muscle is it related to?

A

phrenic nerve (component of the cervical plexus - C1-C4 ventral rami somatic plexus)

  • innervates the diaphragm
  • courses inferiorly on anterior surface of anterior scalene
116
Q

What artery is located immediately deep to the clavicle? What is its origin and destination?

A

suprascapular artery

  • courses posteriorly across floor of posterior triangle, deep to clavicle, to shoulder region to supply supraspinatus and infraspinatus
  • originates from thyrocervical trunk of subclavian artery (1st part), destination is supraspinatus and infraspinatus
117
Q

What artery coursing through the posterior triangle is supplying the trapezius muscle?

A

transverse cervical artery

  • originates from thyrocervical trunk of subclavian artery (1st part)
  • relationship: courses posteriorly across floor of posterior triangle, superior to suprascapular artery to deep surface of trapezius (to supply it)
118
Q

What organ would be in danger of being pierced by a knife directed inferiorly into the posterior triangle?

A

lungs

119
Q

What divides the arm into anterior and posterior compartments? What is the clinical signficance of these kind of compartments?

A

Humerus, intermuscular fascial septum

Muscles in each compartment are responsible for one particular function??

120
Q

What is the general function of the muscles in the anterior compartment of the arm?

A

Flexor compartment - contains 3 muscles (BBC) that flex the humerus at the shoulder and/or the elbow joints

121
Q

What are the muscles of the anterior compartment of the arm? Which muscle only crosses the shoulder joint anteriorly? Which muscle only crosses the elbow joint anteriorly? Which muscle crosses both the elbow and shoulder joints anteriorly?

A

BBC

Coracobrachialis only crosses the shoulder joint anteriorly

Brachialis only crosses the elbow joint anteriorly

Biceps brachii crosses both the elbow and shoulder joints anteriorly

122
Q

Which muscle of the anterior compartment of the arm is also a powerful supinator?

A

Biceps brachii

123
Q

What nerve innervates all the muscles of the anterior compartment of the arm?

A

Musculocutaneous nerve

(The median and ulnar nerves travel through the anterior compartment in the medial neurovascular bundle, but they do NOT innervate anything in the arm. They will innervate the anterior compartment of the forearm and compartments of the hand.)

124
Q

What is the artery to the anterior compartment of the arm?

A

Brachial artery - continuation of the axillary artery and travels down the arm in the medial neurovascular bundle. The brachial artery gives rise to the deep brachial artery (profunda brachii a.) as it enters into the arm. The deep brachial artery will travel into the posterior compartment of the arm and will accompany the radial nerve in the radial groove of the humerus deep to the triceps.

125
Q

What are the contents of the medial neurovascular bundle of the anterior compartment of the arm? Is the musculocutaneous nerve contained within this neurovascular bundle?

A

brachial artery, brachial veins, basilic vein, median nerve, ulnar nerve, and medial antebrachial cutaneous nerve

The musculocutaneous nerve is NOT contained within this neurovascular bundle.

126
Q

Which muscle of the anterior compartment of the arm is pierced through its belly by the musculocutaneous nerve?

A

Coracobrachialis - musculocutaneous nerve pierces through belly of coracobrachialis, and then sits between superficial and deep muscles of the anterior compartment of the arm

127
Q

What are the main structures (muscle, nerve, artery) of the posterior compartment of the arm?

A

triceps (medial, lateral, and long heads), radial nerve, deep brachial artery

128
Q

Which head of the triceps crosses the teres major muscle superficially?

A

Long head??

129
Q

Which head of the triceps crosses the shoulder joint posteriorly?

A

Long head of the triceps

130
Q

What is the relationship of the radial nerve and deep brachial artery to the triceps and humerus?

A

Radial nerve - innervates the triceps. It lies deep to the triceps and travels in the radial groove of the humerus along with the deep brachial artery.

Deep brachial artery (profunda brachii) - branch of the brachial artery and travels with the radial nerve in the radial groove.

131
Q

What is the function of the triceps?

A

All heads are involved with extending forearm at the elbow joint

Long head extends arm at shoulder joint

132
Q

What structures cross the anterior aspect of the cubital fossa superficially from lateral to medial? How would you locate the medial nerve in the cubital fossa to do a nerve block?

A

Lateral to medial:

  • **lateral antebrachial cutaneous nerve: **continuation of the musculocutaneous nerve after it gives off its motor fibers to the anterior compartment muscles and then travels lateral to the biceps tendon.
  • biceps tendon: attaches to both the radial tuberosity and the bicipital aponeurosis which passes obliquely over the brachial artery and median nerve and is continuous with the deep fascia of the forearm.
  • brachial artery: runs in the medial neurovascular bundle of the arm and will divide in the proximal forearm into two terminal branches: the radial and ulnar arteries
  • median nerve: runs in the medial neurovascular bundle of the arm. Along with the ulnar nerve, these two nerves just pass through the arm without innervating anything.

Medial nerve block?

133
Q

Where would you find the radial nerve in the cubital fossa and what are its two terminal branches?

A

To find the radial nerve, look deep in between the brachialis and brachioradialis muscles.

The radial nerve divides into the deep radial nerve (innervates the supinator, then pierces it to get access to the posterior compartment of the forearm where it will innervate all of the muscles of that compartment) and superficial radial nerve (cutaneous nerve that travels deep to the brachioradialis)

134
Q

What nerve travels in the medial neurovascular bundle and then goes posterior to the medial epicondyle of the humerus and then goes back into the anterior compartment of the forearm?

A

Ulnar nerve

135
Q

The forearm is divided into compartments by what structures?

A

Fascial intermuscular septa, interosseous membrane between the radius and ulna

136
Q

What is the general function of the anterior compartment of the forearm?

A

contains muscles which will flex the wrist and/or digits

“flexor” compartment

137
Q

What are the muscles of the superficial layer (flexor-pronator group) in the anterior compartment?

A

pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris

138
Q

What is the muscle of the intermediate layer of the anterior compartment of the forearm?

A

flexor digitorum superficialis

139
Q

What are the muscles of the deep layer of the anterior compartment of the forearm?

A

flexor digitorum profundus, flexor pollicis longus, pronator quadratus

140
Q

What action, aside from flexion, does flexor carpi ulnaris and flexor carpi radialis do?

A

Flexor carpi ulnaris also does ADDUCTION of the hand (ulnar deviation).

Flexor carpi radialis also does ABDUCTION of the hand (radial deviation).

141
Q

What is unusual about the palmaris longus muscle?

A

This muscle is variable. Some people have it and some people don’t. And some people may even have it on one side but not the other!

142
Q

The flexor digitorum superficialis flexes primarily at what joints?

A

medial 4 digits at proximal IP joints

143
Q

The flexor digitorum profundis flexes primarily at what joints?

A

medial 4 digits at distal IP joints (but can also be recruited for MP joints and wrist)

144
Q

What does flexor pollicis longus do?

A

Flexes the thumb

145
Q

Which muscles of the anterior compartment are innervated by the ulnar nerve? Which are innervated by the median nerve?

A

Ulnar nerve - Flexor carpi ulnaris, 1/2 of flexor digitorum profundus

Median nerve - all muscles of the anterior compartment except flexor carpi ulnaris and 1/2 of flexor digitorum profundus

146
Q

What are the terminal branches of the brachial artery?

A

Radial and ulnar arteries

147
Q

The anterior interosseus nerve is a branch of what nerve?

A

Median nerve

148
Q

What is the origin of the common interosseus artery? And what branches does it give rise to? Where are these branches located?

A

The common interosseous artery is a branch of the ulnar artery. It gives rise to the anterior interosseous artery (anterior compartment) and posterior interosseous artery (posterior compartment).

149
Q

What is the basic organization arrangement (in terms of layers and groups) of the musculature of the posterior forearm?

A

The muscles of the posterior compartment are arranged into superficial and deep layers; the superficial layer is further subdivided into a posterior and lateral group.

150
Q

What is the general function of the muscles of the posterior compartment of the forearm?

A

extending at either the wrist, the digits, or both

151
Q

What cutaneous vein travels up the medial side of the forearm? What cutaneous vein travels up the lateral side of the forearm?

A

The basilic vein travels up the medial side of the forearm.

The cephalic vein travels up the lateral side of the forearm.

152
Q

In the superficial layer of muscles in the posterior compartment of the forearm, what muscles comprise the lateral group? Which muscles comprise the posterior group?

A

Lateral group:

  • brachioradialis
  • extensor carpi radialis longus
  • extensor carpi radialis brevis

Posterior group:

  • anconeus
  • extensor carpi ulnaris
  • extensor digitorum
  • extensor digiti minimi
153
Q

What main nerve, either directly or indirectly, controls the muscles and function of the posterior forearm compartment?

A

Posterior interosseous nerve, a branch of the radial nerve

154
Q

What is the artery of the posterior compartment of the forearm?

A

Posterior interosseous artery (continuation of deep radial artery)

155
Q

What are the muscles of the deep layer of the posterior forearm compartment?

A
  • supinator
  • abductor pollicis longus
  • extensor pollicis brevis
  • extensor pollicis longus
  • extensor indicis
156
Q

Which muscles of the posterior forearm compartment act on the digits (other than the thumb)?

A
  • extensor digitorum
  • extensor digiti minimi
  • extensor indicis
157
Q

Which muscles of the posterior forearm compartment act on the wrist?

A
  • extensor carpi ulnaris
  • extensor carpi radialis brevis
  • extensor carpi radialis longus
158
Q

Which muscle of the posterior forearm opposes the action of the pronator muscles of the anterior compartment?

A

Supinator

159
Q

Which tendons form the immediate boundaries of the anatomical “snuff-box”?

A
  • extensor pollicis brevis (along with abductor pollicis longus)
  • extensor pollicis longus
  • extensor retinaculum along the bottom
160
Q

The pulse of what artery can be taken by palpating the floor of the snuff-box?

A

Radial artery

161
Q

What carpal bone, if fractured, would be painful as you palpate the floor of the anatomical snuff-box?

A

Scaphoid

162
Q

What are the extensor expansions?

A

flattening of extensor tendons distally (in digits)

163
Q

What is the function of the extensor retinaculum?

A

band of deep fascia that keeps the extensor tendons in place when the extensor muscles contract

164
Q

What bones are involved in the wrist joint?

A
  • distal radius
  • proximal carpal bones: scaphoid, lunate, triquetrum
165
Q

What actions are allowed at the wrist?

A

flexion, extension, ulnar deviation (adduction), radial deviation (abduction), circumduction

166
Q

What nerves innervate the wrist joint?

A

ulnar and median nerves?

167
Q

From medial to lateral, what structures cross the wrist anteriorly?

A

Medial to lateral: flexor carpi ulnaris tendon, ulnar nerve, ulnar artery, palmaris longus tendon, median nerve, flexor carpi radialis tendon, radial artery

168
Q

Which structure forms the roof of the carpal tunnel?

A

flexor retinaculum

169
Q

Which structures are contained within the carpal tunnel?

A
  • 4 flexor digitorum superficialis tendons
  • 4 flexor digitorum profundus tendons
  • flexor pollicis longus tendon
  • median nerve
170
Q

What would be the symptoms of inflammation and compression within the carpal tunnel? What nerve would be affected? How might those symptoms be relieved surgically?

A

Compression of the median nerve

  • sensory: pain and sensory deficits (paresthesia, hypothesia, anesthesia) along the distribution of its cutanous branches, which innervate the 3 1/2 lateral digits of the hand
  • motor: motor deficits to thenar compartment muscles and lateral 2 lumbrical muscles; muscle weakness, loss of coordination, inability to oppose the thumb

These symptoms may be relieved by carpal tunnel release, a partial or complete surgical division of the flexor retinaculum.

171
Q

What are the four compartments of the hand?

A
  • thenar
  • hypothenar
  • central (midpalmar)
  • deep (adductor, interossei)
172
Q

What muscles are contained within the thenar compartment and what are their functions?

A

3 muscles relating to the thumb:

  • abductor pollicis brevis
  • flexor pollicis brevis
  • opponens pollicis
173
Q

What muscles are contained within the hypothenar compartment and what are their functions?

A

3 muscles relating to the 5th digit:

  • abductor digiti minimi
  • flexor digiti minimi
  • opponens digiti minimi
174
Q

What structures are contained within the central compartment?

A

flexor tendons (FDS, FDP), 4 lubricals

175
Q

What is the innervation pattern of the lumbrical muscles and what is their function?

A

Innervation pattern

  • lateral 2: median nerve
  • medial 2: ulnar nerve

Function: flex at the MCP joints and extend at the IP joints of digits 2-5

176
Q

What muscles are contained within the deep compartment?

A

adductor pollicis, interossei (palmar and dorsal)

177
Q

What is the function of the dorsal interossei muscles and how many are there?

A

4 dorsal interossei muscles; function to ABDUCT the digits

178
Q

What is the function of the palmar interossei muscles and how many are there?

A

4 palmar interossei muscles; function to ADDUCT the digits

179
Q

Describe the blood supply to the hand.

A

brachial artery -> ulnar and radial arteries in the forearm -> superficial and deep palmar arches -> common palmar digital arteries -> proper palmar digital arteries

180
Q

Which artery is predominant in the formation of the superficial palmar arch?

A

Ulnar artery

181
Q

Which artery is predominant in the formation of the deep palmar arch?

A

Radial artery

182
Q

The deep palmar arch accompanies the deep branch of the ulnar nerve in a neurovascular plane between what two compartments?

A

Anterior and posterior compartments of the forearm?

183
Q

Which compartment of the hand is completely innervated by the median nerve (in terms of its muscles)?

A

thenar compartment

184
Q

Which muscles of the central compartment are innervated by the median nerve? Which are innervated by the ulnar nerve?

A

median nerve: lateral 2 lumbricals

ulnar nerve: medial 2 lumbricals

185
Q

The muscles of the hypothenar compartment and deep compartment are innervated by what nerve?

A

Ulnar nerve

186
Q

On the palmar aspect of the hand, which nerve supplies the skin of the lateral 3 ½ digits and related palm area?

A

Median nerve

187
Q

On the palmar aspect of the hand, which nerve supplies the skin of the medial 1 ½ digits and related palm area?

A

Ulnar nerve

188
Q

On the dorsum of the hand, which nerve supplies the skin of the lateral 3 ½ digits (up to the knuckles approximately) and related back of the hand area?

A

Superficial radial nerve

189
Q

On the dorsum of the hand, which nerve supplies the skin of the tips of the lateral 3 ½ digits?

A

Median nerve

190
Q

On the dorsum of the hand, which nerve supplies the skin of the medial 1 ½ digits and related back of the hand area?

A

Ulnar nerve

191
Q

Why are dermatomal maps different from cutaneous nerve pattern maps? How might each be useful in the clinics?

A

A dermatome is a strip of skin innervated by fibers from a single spinal cord level. A cutaneous nerve contains fibers from several spinal cord levels.

Knowing these two different patterns allows one to test for peripheral nerve problems (cutaneous nerve innervation pattern) or neurologic (spinal cord or spinal nerve) level problems (dermatomal pattern).

192
Q

What are the 3 articulations of the elbow joint?

A

humeroulnar, humeroradial, radioulnar

193
Q

What nerves innervate the elbow joint?

A

Median and ulnar nerves?

194
Q

At what articulations of the elbow joint does flexion/extension occur?

A

humeroulnar, humeroradial joints

195
Q

At what articulation of the elbow joint does supination/pronation occur?

A

proximal radioulnar joint

196
Q

What ligaments strengthen the elbow joint medially and laterally? How might the integrity of these ligaments be tested?

A

Radial collateral ligament (LCL), ulnar collateral ligament (MCL)

Integrity tested by supination/pronation?

197
Q

What is the function of the annular ligament?

A

helps protect the proximal radioulnar joint and allows the head of the radius to move beneath it while preventing it from being displaced

198
Q

Bursitis at the elbow would involve which bursae potentially?

A

Subtendinous olecranon bursa (deep to triceps tendon), subcutaneous olecranon bursa (in superficial fascia over olecranon process)

199
Q

The arterial anastomosis around the elbow joint involves branches from which main arteries?

A

Brachial, deep brachial, ulnar, radial

200
Q

What are the three gluteal muscles? What is their function and innervation?

A

Gluteus maximus

  • action: main extensor of thigh, lateral rotator of thigh, helps steady the extended leg
  • innerv: inferior gluteal nerve

Gluteus medius

  • action: abducts and medially rotates thigh, helps steady the pelvis
  • innerv: superior gluteal nerve

Gluteus minimus

  • action: abducts and medially rotates thigh, helps steady the pelvis
  • innerv: superior gluteal nerve
201
Q

What is the “safe area” of the gluteal region for intramuscular injections?

A

Upper outer (lateral) quadrant; using any of the other three quadrants can put the sciatic nerve at risk and cause very serious damage

202
Q

What is the function of the piriformis, gemelli, obturator internus, and quadratus femoris muscles?

A

laterally rotate extended thigh, all but quad. femoris also abduct flexed thigh

203
Q

What spinal cord level is considered to be mainly responsible for extension at the hip?

A

L2-4 (femoral) ?

204
Q

What is the relationship of the sciatic nerve to the piriformis muscle?

A

The sciatic nerve is inferior to the piriformis muscle.

205
Q

The sciatic nerve is a branch of what nerve plexus?

A

Sacral plexus (largest branch, L4-S3)

206
Q

The sciatic nerve innervates what compartments and regions of the lower limb?

A

tibial division of sciatic nerve: hamstrings in the posterior thigh

fibular division of sciatic nerve: short head of biceps femoris

tibial nerve: foot, posterior compartment of leg

fibular nerve: anterior and lateral compartments

207
Q

What fascia completely surrounds the thigh like a “sock”?

A

fascia lata

208
Q

What are the three hamstrings? What is their function (at the hip and the knee) and innervation?

A

semitendinosus

  • action: extend hip and flex knee
  • innervation: tibial division of sciatic nerve

semimembranosus

  • action: extend hip and flex knee
  • innervation: tibial division of sciatic nerve

biceps femoris

  • action: flex knee and laterally rotate leg, long head - extend hip
  • innervation: long head - tibial division of sciatic nerve, short head - common peroneal division of sciatic nerve
209
Q

What is the common proximal attachment of the hamstring muscles?

A

ischial tuberosity (exc short head of biceps femoris - linea aspera of femur)

210
Q

Which hamstring is innervated by both divisions of the sciatic nerve?

A

biceps femoris (long head - tibial division, short head - common peroneal division)

211
Q

What are the boundaries of the popliteal fossa?

A

hamstrings and gastrocnemius muscles

212
Q

What are the contents of the popliteal fossa?

A

popliteal artery and vein, tibial nerve, common peroneal nerve

213
Q

What is the origin of the popliteal artery?

A

continuation of the femoral artery (after diving into adductor hiatus?)

214
Q

Which nerve of the popliteal region will continue into the posterior compartment of the leg?

A

tibial nerve (innervates posterior compartment and foot. common peroneal nerve innervates anterior and lateral compartments of leg)

215
Q

What compartments are controlled by the common peroneal (fibular) nerve? What are the general functions of these compartments?

A

anterior and lateral compartments of the leg; dorsiflexion and plantar flexion, respectively

216
Q

What vein coursing through the superficial fascia of the anteromedial thigh can be used in coronary bypass operations?

A

great saphenous vein

217
Q

What are the anterior compartment muscles? What is the overall general function of most of these muscles of this compartment?

A

sartorius, iliopsoas, quadriceps (rectus femoris, vastus medialis, vastus intermedius, vastus lateralis)

function: flex hip, extend knee

218
Q

Which of the anterior compartment muscles is not innervated by the femoral nerve?

A

iliopsoas (psoas major by ventral rami of L1-L3, iliacus by femoral nerve)

219
Q

Which of the anterior compartment muscles crosses two joints?

A

sartorius (hip and knee)

220
Q

Which of the anterior compartment muscles flexes the hip and extends the knee?

A

quadriceps (rectus femoris, vastus medialis, vastus intermedius, vastus lateralis)

221
Q

What is the main artery of the anterior compartment?

A

femoral artery - branches into profunda femoris artery. Both of these arteries then give rise to the lateral and medial circumflex arteries that anastomose around the head and neck of femur

222
Q

What is the origin of the femoral vein? How and where does it terminate?

A

Originates from the popliteal vein, terminates in the external iliac vein (?)

223
Q

What is the origin of the femoral artery? How and where does it terminate?

A

Originates from the external iliac artery, terminates in the popliteal artery (after femoral artery passes through adductor hiatus in anterior compartment of thigh)

224
Q

The adductor canal is deep to what muscle? What are the contents of the canal?

A

deep to sartorius; contains femoral artery and vein, nerve to vastus medius, saphenous nerve

225
Q

The vessels passing inferiorly from the adductor canal through the adductor hiatus pass into what region?

A

posterior compartment of the thigh

226
Q

What are the boundaries of the femoral triangle?

A

sartorius, inguinal ligament, adductor longus

227
Q

What are the major contents of the femoral triangle?

A

femoral nerve, artery, and vein, inguinal lymph nodes

228
Q

What is the femoral sheath and how is it organized?

A

formed by transversalis fascia (deep to fascia lata), divided into medial (femoral canal), intermediate (femoral vein), and lateral (femoral artery) compartments

229
Q

What normally occupies the femoral canal? Why is this space clinically important?

A

Nothing normally occupies the femoral canal; this space is clinically important because it is the site of femoral hernias.

230
Q

What set of nodes are in the superficial fascia over the femoral triangle region? Infections from what part of the body might result in enlargement of these nodes which can then be palpated?

A

Inguinal lymph nodes; infection from groin?

231
Q

What are the muscles of the medial (adductor) compartment of the thigh?

A

pectineus, adductors (longus, brevia, magnus), gracilis

232
Q

Most of the muscles in this compartment are innervated by which nerve? What are the exceptions to this?

A

Obturator nerve (L2-L4); adductor magnus (hamstring part) innervated by tibial division of sciatic nerve

233
Q

What is the general overall function of muscles of medial compartment of thigh?

A

adduction and flexion of thigh

234
Q

What are the arteries of this compartment? Which of these is a branch of the internal iliac artery? Which is a branch of the femoral artery?

A

obturator artery - branch of internal iliac artery

deep femoral artery - branch of the femoral artery

235
Q

Does the posterior compartment of the thigh have its own major artery? How does the posterior compartment get supplied?

A

No, the posterior compartment is supplied by perforating branches of the deep femoral artery.

236
Q

What is the name of the fascia which completely surrounds the musculature of the leg in a “sock-like” manner and is continuous with the fascia lata? Is this fascia tough or elastic? How does this fascia play a role in anterior compartment syndrome?

A

Crural fascia. This fascia is tough and non-elastic, which contributes to its role in anterior compartment syndrome (compresses anterior tibial artery and deep peroneal nerve within the anterior compartment).

237
Q

What are the muscles of the anterior compartment of the leg? What is the general function of these muscles?

A
  • tibialis anterior
  • extensor digitorum longus
  • extensor hallucis longus
  • peroneus tertius

These muscles are generally extensors (dorsiflexors).

238
Q

What is the nerve of the anterior compartment of the leg? Does this nerve innervate all the muscles in this compartment or are there exceptions?

A

Deep peroneal nerve; innervates ALL the muscles in this compartment w/o exception

239
Q

What is the artery of this compartment? How does it originate? How does it terminate?

A

Anterior tibial artery; originates from the popliteal artery; terminates as the dorsalis pedis artery

240
Q

What is anterior compartment syndrome and how are the anatomical structures in the anterior compartment affected in this syndrome? What surgical procedure is used to relieve the symptoms of this syndrome?

A

Anterior compartment syndrome: compression of structures within the anterior compartment of the leg as a result of increased production of tissue fluid (e.g. from fracture)

A fasciotomy is the surgical procedure that relieves these symptoms.

241
Q

What are the two muscles of the lateral compartment of the leg? What is the general function of these muscles, and what nerve controls that function?

A

Peroneus longus and brevis. These muscles are generally evertors, and are controlled by the superficial peroneal nerve.

242
Q

What is the general function of the posterior compartment of the leg muscles? What is the nerve that innervates all these muscles?

A

Flexors of digits and plantar flexors of the foot; tibial nerve

243
Q

Within the posterior compartment of the leg, what are the three muscles of the superficial layer? What is their function? (be specific)

A
  • gastrocnemius: plantar flexes foot, flexes knee
  • soleus: plantar flexes foot
  • plantaris: weak plantar flexor, weak knee flexor
244
Q

Name proximal and distal attachment, action, and innervation of

GASTROCNEMIUS muscle

A

proximal attachment: medial and lateral femoral condyles

**distal attachment: **calcaneus via calcaneal tendon

**action: **plantar flexes foot, flexes knee

innervation: tibial nerve

245
Q

Name proximal and distal attachment, action, and innervation of

SOLEUS muscle

A

proximal attachment: posterior superior fibula, fibular head, soleal line of tibia

**distal attachment: **calcaneus via calcaneal tendon

**action: **plantar flexes foot

innervation: tibial nerve

246
Q

Where is the tibial nerve and posterior tibial artery found in relation to the superficial and deep layers of muscles in the posterior compartment of the leg?

A

Found in between superficial and deep layers of posterior compartment muscles

247
Q

Inferior to the posterior compartment of the leg, what will the tibial nerve be responsible for innervating in general?

A

Plantar foot

248
Q

Within the posterior compartment of the leg, what are the muscles of the deep layer? Which of these is not a plantar flexor; what does this muscle do?

A
  • popliteus
  • flexor digitorum longus
  • flexor hallucis longus
  • tibialis posterior

The popliteus is not a plantar flexor; it functions to unlock the knee.

249
Q

Pain resulting from sciatica due to pressure on and/or inflammation of the sciatic nerve would radiate down the dermatomes on what side of the thigh and leg? (i.e., the sciatic nerve is comprised of fibers from which spinal cord segments?)

A

L4-S3 dermatomes

250
Q

How does the venous pump system of the lower limb work?

A

muscles of the posterior compartment pump blood back to heart?

251
Q

What are main superficial veins of the lower limb? Which of these veins is related posteriorly to the lateral malleolus?

A

great (medial) and small saphenous veins (lateral); small saphenous vein is related posteriorly to lateral malleolus?

252
Q

How many compartments does the foot have?

A

4: thenar, hypothenar, central, deep

253
Q

How many muscles are in the Compartment of the Great Toe?

A

2: abductor hallucis, flexor hallucis brevis

254
Q

How many muscles are in the Compartment of the Little Toe?

A

2: abductor digiti minimi, flexor digiti minimi

255
Q

What structures (including muscles) do we find in the Central Compartment?

A

lumbricals, flexor tendons (of flexor digitorum brevis, flexor digitorum longus), muscle bellies (of flexor digitorum brevis, quadratus plantae)

256
Q

What muscles are found in the Deep Compartment of the foot?

A

adductor hallucis, dorsal and palmar interossei muscles

257
Q

What structures help maintain the arches of the foot?

A

longitudinal arch: long plantar ligament, spring ligament

transverse arch: peroneus longus tendon

258
Q

Which two nerves innervate all of the muscles of the foot and what is their origin (i.e., they are branches of which larger nerve)?

A

Medial and lateral plantar nerves; branches of tibial nerve

Block 4 (5 decks)

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