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Thorax > Thorax > Flashcards

Thorax Flashcards

1
Q

Transversus thoracis

A

Posterior surface of the lower sternum

Internal surfaces of costal cartilages 2-6

Intercostal n

Weakly depresses the ribs

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2
Q

Sternocleidomastoid

A

Lateral surface of mastoid process of temporal bone and lateral 1/2 of superior nucal line

Sternal head: anterior surface of manubrium of sternum

Clavicular head: medial 1/3 of clavicle

Spinal accessory n CN XI

Unilaterally tilts the head to the same side, contralateral rotation
Bilateral: extends neck at atlantooccipital joint
Extends superior cervical
Flexes inferior cervical vertebrae
Assists in pump handle movement for deep respiration

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3
Q

Mylohyoid

A

Mylohyoid line of mandible

Mylohyoid raphe and body of hyoid

Nerve to mylohyoid, a branch of inferior alveolar n
CN V3 mandibular n

Elevates hyoid, floor of mouth, tongue during swallowing

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4
Q

Geniohyoid

A

Inferior mental spine of mandible

Body of hyoid

Hypoglossal n (CN XII)

Pulls hyoid anterosuperiorly, shortens floor of mouth, widens pharynx

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5
Q

Stylohyoid

A

Styloid process of temporal bone

Body of hyoid

Stylohyoid branch of facial n (CN VII)

Elevates and retracts hyoid

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6
Q

Digastric

A

Anterior belly: digastric fossa of mandible
Posterior belly: mastoid notch of temporal bone

Intermediate tendon to body and greater horn of hyoid

Ant belly: CN V3
Post belly: CN VII

Elevates hyoid during deglutition, depresses mandible against resistance

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7
Q

Sternohyoid

A

Manubrium and medial end of clavicle

Body of hyoid

Cervical anterior rami

Depresses hyoid after deglutition

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8
Q

Omohyoid

A

Superior border of scapula

Inferior border of hyoid

Cervical anterior rami

Depresses and retracts hyoid
Attaches to intermediate tendon/ sling

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9
Q

Sternothyroid

A

Posterior surface of manubrium

Oblique line of thyroid cartilage

CAR

depresses hyoid and larynx

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10
Q

Thyrohyoid

A

Oblique line of thyroid cartilage

Inferior border of body and greater horn of hyoid

CN XII hypoglossal n

Depresses hyoid and elevates larynx

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11
Q

Scalenes

A

Anterior C3-C6 transverse process
Middle C5-C7 transverse
Attach to the first rib

CAR

Bilateral cervical flexion

Unilateral: ipsilateral cervical sidebending, contralateral rotation

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12
Q

Carotid sheath

A

CVI

Common carotid artery (medial)

Vagus n

Internal jugular vein (lateral)

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13
Q

Psoas mj

A

Transverse processes of lumbar vertebrae- sides of bodies and IVD of T12-S1

Lesser trochanter of the femur

Lumbar plexus anterior branches of n L2-L4

Acting inferiorly with iliacus, flexes thigh

Acting superiorly, flexes vertebral column laterally to balance trunk

When sitting, acts inferiorly w iliacus to flex trunk

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14
Q

Iliacus

A

Superior 2/3 of iliac fossa, ala of sacrum, anterior sacroiliac ligaments

Lesser trochanter of femur, and shaft inferior to it and psoas mj tendon

Femoral n L2-L4

Flexes thigh, stabilizes hip joint, acts w psoas mj

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15
Q

Quadratus lumborum

A

Medial 1/2 of inferior border of 12th rib & tips of lumbar transverse processes

Iliolumbar ligament and internal lip of iliac crest

Anterior branches of T12&L1-L4 n

Extends and laterally flexes vertebral column
Fixes 12th rib during inspiration

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16
Q

External oblique

A

External surfaces of 5th-12th ribs

Linea alba, pubic tubercle, anterior 1/2 of iliac crest

Thoracoabdominal n
Subcostal n

Compress and support abdominal viscera

Flex and rotate trunk

17
Q

Internal oblique

A

Thoracolumbar fascia, anterior 2/3 of iliac crest, connective tissue deep to inguinal ligament

Inferior borders of 10th-12th ribs, linea alba, pubis

Thoracoabdominal n
Subcostal n
First lumbar n

Compress and support abdominal viscera
Flex and rotate trunk

18
Q

Transversus abdominis

A

Internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, inguinal ligament

Linea alba with aponeurosis of internal oblique, pubic crest, pubis

Thoracoabdominal n
Subcostal n
First lumbar n

Compress and support abdominal viscera

19
Q

Rectus abdominis

A

Pubic symphysis and pubic crest

Xiphoid process and 5th-7th costal cartilages

Thoracoabdominal and subcostal n

Flexes trunk (lumbar vertebrae)
Compresses abdominal viscera 
Stabilizes and controls tilt of pelvis (antilordosis)
20
Q

External intercostal

A

Inferior border of ribs

Superior border of ribs below

Intercostal n

Elevate ribs during forced inspiration

21
Q

Internal intercostal

A

Superior border of ribs

Inferior border of rib above

Intercostal n

Forced respiration, interosseous part depresses ribs, interchondral part elevates ribs

22
Q

Serratus anterior

A

External surfaces of lateral parts of ribs 1-8

Anterior surface of the medial border of the scapula

Long thoracic n

Protracts the scapula and holds it against the thoracic wall

Rotates the scapula superiorly

23
Q

Subclavius

A

Junction of 1st rib and it’s costal cartilage

Interior surface of middle 1/3 of clavicle

N to subclavius

Anchors and depresses clavicle

24
Q

Pectoralis major

A

Clavicular head: anterior surface of medial 1/2 of clavicle

Sternocostal head: anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique

Lateral lip of the intertubercular groove of the humerus
Crest of the greater tubercle

Lateral and medial pectoral n

Adducts and medically rotates the shoulder joint
Draws the scapula anteriorly and inferiorly
Clavicular head flexes shoulder joint and sternocostal extends from a flexed position

25
Q

Diaphragm

A

Back of the sternum, inside of costal arch, around to the tip of the 12th rib

Phrenic n

When contracting, whole muscle and central tendon moves down, expanding lungs as causing us to breathe

26
Q

Anterior triangle

A

Midline of neck anteriorly
SCM posteriorly

Contains Supra and infrahyoid muscles

27
Q

Posterior triangle

A

SCM anteriorly
Upper trapezius posteriorly
Clavicle inferiorly

Spinal accessory n
Branches of cervical plexus
Roots and trunks of racial plexus
Phrenic n 
Subclavian artery
Inferior belly of omohyoid
All 3 scalenes
Levator scapula 
Splenius cervicis capitus
28
Q

Pectoralis minor

A

3rd-5th ribs near costal cartilages

Coracoid process of scapula

Medial pectoral n

Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Downward rotation of scapula

Thorax (1 decks)

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