MSK Flashcards
Bone embryo
Axial/appendicular: mesoderm
Skull: ectoderm, neural crest
Joint embryo
mesoderm
Muscle embryo
mesoderm
smooth muscle: ectoderm
Compact Bone microanatomy
dense portion closer to surface of bones
lamellar bone arranged in sheets
osteons contain Haversian canal w/ artery and nerves
concentric layers radiate out from osteons
lacunae contain osteocytes
osteoblast line outside of the osteons
Spongy Bone microanatomy
inner portion of bone
contain trabecula, interconnected cavities, small amount of lamellar bone (sheets of cartilage), long beam like structure with bone marrow in the spaces between
Fibrous joint microanatomy
fibrous connective tissue
wide sheet of connective tissue
Cartilaginous joint microanatomy
hyaline cartilage or fibrocartilage
Synovial joint microanatomy
outer fibrous capsule
inner synovial membrane: synovial fluid and blood vessels
articular cartilage (hyaline)
Skeletal muscle microanatomy
epimysium-> perimysium ->fascicle -> muscle fiber -> endomysium -> myocyte -> long cylinder cells w/ multiple nuclei under sarcolemma contain t-tubules, myofibrils-> sarcomeres (actin, myosin)
Cardiac muscle microanatomy
striated organized into sarcomeres, branched cells w/ 1-2 centrally located nuclei, intercalated disks (connect myocytes)
endomysium, t-tubules, sarcomere, sarcoplasmic reticulum, pacemaker cells
Smooth Muscle microanatomy
thin and thick myofilaments
fusiform, one nucleus, wrapped in endomysium
no t-tubules, less sarcoplasmic reticulum, caveolae
Where is each muscle type found?
skeletal: attach to bones
cardiac; heart
smooth: walls of hollow organs
Skeletal muscle contraction
motor signal from brain -> spinal cord -> motor neuron release Ach -> Ach binds to receptor -> rapid shift of ion across sarcolemma -> t-tubules bring Ca into myocyte -> sarcoplasmic reticulum releases Ca into sarcoplasm -> Ca causes actin and myosin to pull in on each other -> sarcoplasmic reticulum stores ca -> muscle relaxation
Skeletal muscle regulation
how long ca stays in the sarcoplasm, size of muscle, how many are contracting, how close the actin and myosin filament are to each other, how fast the muscle is contracted (slower = more force bc more myosin head can attach), somatic nervous system
Smooth muscle contraction
AP depolarizes membrane -> Ca enters vis L-type Ca channels-> binds to calmodulin -> activates myosin kinase -> phosphorylates myosin heads to form cross-bridges w/ actin -> activates another smooth muscle
no ATP required and maintain low-level contraction for long periods
Cardiac regulation
autorhythmicity, ANS
Cardiac contraction
Ca flows gap junction -> threshold is reached -> na channels open up -> ions move across cell membrane -> ca flows into cell binding to ryanodine receptor on SR -> Ca released into cell -> bind to troponin c -> tropomyosin slide off -> actin and myosin to bind -> ca removed vi ATP or concentration gradient -> no actin and myosin binding
Vertebrae structure
body arch: pedicles, laminae spinous process 2 transverse process 2 inferior articular process 2 superior articular process
Vertebrae Colum structure
body gets bigger as you go down arch: pedicles, laminae spinous process 2 transverse process 2 inferior articular process 2 superior articular process Cervical 7 thoracic 12 Lumbar 5
Vertebrae column function
support weight, protect spinal cord,
Skull bone function
protects brain
Skull viscerocranium structure
mandible, vomer, ethmoid,
2 of each maxilla, inferior nasal concha, zygomatic, nasal, lacrimal, palatine
Skull neurocranium location
house brain, cranial meninges, blood vessels, and cranial nerves
Skull neurocranium structure
frontal, ethmoid, sphenoid, occipital,
2 of each temporal and parietal
Pectoral girdle axioappendicular muscles structure
Anterior: pec major, pec minor, subclavius, serratus anterior
Pectoral girdle function
make upper limb function
Pectoral girdle axioappendicular muscles structure
Anterior: pec major, pec minor, subclavius, serratus anterior
Posterior: trapezius, latissimus dorsi, levator scapulae, rhomboids
Pectoralis Major action
adduction, medial rotation, flexion of arm, extend back from flexed position
Pectoral girdle scapulohumeral muscles structure
teres major, deltoid, supraspinatus, infraspinatus, teres minor, subscapularis (SItS muscles)
Pectoralis Minor O, I, N
O: anterior surface of 3-5 ribs
I: coracoid process of scapula
N: medial pectoral nerve
Pectoralis Major action and artery
adduction, medial rotation, flexion of arm, extend back from flexed position
pectoral artery and deltoid artery
Subclavius O, I, N
O: 1st rib and costal cartilage
I: inferior surface of middle third of clavicle
N: nerve to subclavius (C5, C6)
Pectoralis Minor action and artery
stabilize scapula, deep inhalation, scapula inferior and anterior
pectoral artery
Serratus anterior O, I, N
O: external surface of lateral parts of the upper eight ribs
I: anterior aspect of medial border and inferior angle of scapula
N: long thoracic nerve ( C5-7)
Subclavius action and artery
stabilize acromioclavicular joint, anchoring and depressing clavicle
clavicular artery
Serratus anterior Actions and artery
protract scapula (punching), anchors scapula by holding it close to thoracic wall (push ups), cause scapula to rotate upward (arms above head)
Trapezius O, I, N
O: medial 1/3 of superior nuchal line, EOP, nuchal ligament, spinous processes of C7-T12
I: lateral 1/3 of clavicle, acromion, spine of scapula
N: spinal accessory nerve and anterior rami of C3-4
Trapezius action
elevation of scapula, retracts scapula, pulls scapula down, rotates scapula superiorly
Latissimus Dorsi O, I, N
O: iliac crest, thoracolumbar fascia, inferior 6 thoracic vertebrae, inferior 3-4 ribs
I: floor of intertubercular groove of humerus
N: thoracodorsal nerve
Latissimus Dorsi action
extends and medially rotates humerus, adducts humerus
Levator scapulae O, I, N
O: posterior tubercles of transverse process of C1-C4
I: medial border of scapula, superior to root of scapular spine
N: dorsal scapular nerve, anterior rami of C3-4
Levator scapulae O, I, N
first 4 -2-2-4 RULE
O: posterior tubercles of transverse process of C1-C4
I: medial border of scapula, superior to root of scapular spine
N: dorsal scapular nerve, anterior rami of C3-4
Rhomboids minor O, I, N
4-2-2 C7 &T1 -4 RULE
O: nuchal ligament, spinous process of C7-T1
I: medial border of scapula at spine of scapula
N: dorsal scapular nerve
Rhomboids action
scapular retraction, downward rotation of scapula, assist serratus anterior in holding scapula against thoracic wall
Rhomboids major O, I, N
4-2-2-4 RULE where this is last 4
O: spinous process of T2-5
I: medial border of inferior scapula to spine of scapula
N: dorsal scapular nerve
Deltoid O, I, N
O: spine of scapula, acromion process, and lateral 1/3 of clavicle
I: deltoid tuberosity of humerus
N: axillary nerve
Deltoid action
arm abduction, extension, lateral rotation, abduction, flexion, and medial rotation
Teres major O, I, N
O: posterior surface of inferior angle of scapula
I: medial lip of intertubercular groove of humerus
N: lower subscapular nerve
Teres Major action
adduction and medial rotation
Supraspinatus O, I, N
O: supraspinous fossa of scapula
I: superior facet of the greater tubercle of the humerus
N: suprascapular nerve
Supraspinatus action
abduction
Infraspinatus O, I, N
O: infraspinous fossa of the scapula
I: middle facet of the greater tubercle of the humerus
N: suprascapular nerve
Infraspinatus O, I, N
O: infraspinous fossa of the scapula
I: middle facet of the greater tubercle of the humerus
N: suprascapular nerve
Infraspinatus action
rotates arm laterally
Teres minor O, I, N
O: middle part of lateral border of the scapula
I: inferior facet of the greater tubercle of the humerus
N: axillary nerve
Teres minor action
rotates arm laterally
Subscapularis O, I, N
O: subscapular fossa
I: lesser tubercle of humerus
N: upper and lower subscapular nerve
Subscapularis action
medial rotation
Quadrangular space
boarders: teres minor, teres major, long head of triceps brachii, shaft of humerus
Contents: axillary nerve and posterior circumflex humeral artery
Triangular space
Borders: teres minor, long head of triceps brachii, teres major,
contents: circumflex scapular artery
Upper extremity structure
pectoral girdle: clavicle and scapula arm: humerus forearm: radius ulna Wrist: Scaphoid, Lunate, Triquetrum, Pisiform, Hamate, Capitate, Trapezoid, Trapezium Hand: 5 metacarpal, 5 dips, and 4 pips
Upper extremity function
move arm, pick up things, walking
Pelvic girdle structure
pelvis (ilium, ischium, pubis)
sacrum
coccyx
Pelvic girdle function
transfer weight when sitting or standing
attachment points for muscles of locomotion and posture
support and protection of abdominopelvic structures
Lower extremity structure
Pelvis, sacrum, coccyx femur tibia fibula patella calcaneus, talus, cuboid, navicular, cuneiform 5 metatarsals 5 proximal, 4 middle, 5 distal
Lower extremity function
locomotion
radiocarpal joint structure
condyloid type of synovial joint, joint capsule
radius, scaphoid, lunate, triquetrum
reinforced by palmar ligaments (distal radius to two rows of carpal bones), dorsal radiocarpal ligaments, ulnar collateral, radial collateral
Muscles: flexor carpi radialis, flexor carpi ulnaris, extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris, flexor carpi radialis, extensor carpi radialis longus, abductor pollicis longus, and extensor carpi radialis brevis
radiocarpal joint innervation/blood supply
dorsal and palmar carpal arches
median, ulnar, radial nerve
radiocarpal joint function
flex, extend, radially deviate, ulnar deviate
intercarpal joints structure
plane type of synovial joint
carpal bones
intercarpal joints innervation
median, ulnar, radial nerve
intercarpal joints function
augment motion of radiocarpal joint
Carpometacarpal Joints structure
carpal and metacarpal
1st is saddle type
2-5 plane type synovial
Carpometacarpal Joints innervation
median, ulnar, radial nerve
Carpometacarpal Joints function
movement of thumb
Intermetacarpal joints structure
bw two metacarpals
Intermetacarpal joints innervation
median, ulnar, radial nerve
Metacarpophalangeal joints structure
metacarpal and proximal phalanges
condyloid synovial joints surrounded by joint capsule
Metacarpophalangeal joints innervation
median, ulnar, radial nerve
Metacarpophalangeal joints function
adduction, flexion, and extension
Interphalangeal joints function
flexion and extension
Interphalangeal joints structure
proximal and middle phalanges or middle and distal phalanges
hinge type of synovial joint
Interphalangeal joints innervation
median, ulnar, radial nerve
Sternoclavicular joint structure
clavicular notch of the manubrium, medial end of clavicle, and first costal cartilage
saddle synovial and fibrous capsule
surrounded by anterior & posterior sternoclavicular ligament, interclavicular lig, and costoclavicular lig
Sternoclavicular joint innervation
medial supraclavicular nerve and nerve to subclavius
Sternoclavicular joint function
connection between the axial skeleton and the upper limb
Acromioclavicular joints structure
lateral end of clavicle and tip of acromion
plane type joint and fibrous capsule
attached by: acromioclavicular lig, conoid lig, trapezoid lig,
Acromioclavicular joints innervation
articular branches of the suprascapular, axillary, and lateral pectoral nerves
Acromioclavicular joints function
scapula to the clavicle and serves as the main articulation that suspends the upper extremity from the trunk, allow the scapula additional range of rotation on the thorax
Glenohumeral joint structure
ball and socket
humerus and glenoid cavity, glenoid labrum, joint capsule w/ internal synovial lining, sub-acromial bursa and sub-tendinous bursa of the subscapularis
reinforced by: coracohumeral lig, coracoacromial lig, and glenohumeral ligaments
Rotator cuff: supraspinatus, infraspinatus, teres minor, and subscapularis
Glenohumeral joint innervation
N: axillary, suprascapular, lateral pectoral
blood: anterior and posterior circumflex humeral a, suprascapular a
Humero-ulnar joint structure
Hinge type bw trochlea and trochlear notch of ulna, joint capsule, subcutaneous olecranon bursa, subtendinous olecranon bursa, intratendinous olecranon bursa, bicipitoradial bursa
Reinforced by: ulnar collateral lig,
Humero-ulnar function
extends and flexion
Humero-ulnar innervation
musculocutaneous and ulnar
Humero-radial joint structure
hinge type bw capitulum and head of radius
joint capsule, subcutaneous olecranon bursa, subtendinous olecranon bursa, intratendinous olecranon bursa, bicipitoradial bursa
Humero-radial joint function
extends and flexion
Humero-radial joint innervation
musculocutaneous and radial
proximal radioulnar joint structure
pivot type w/ head of radius and radial notch of ulna, annular lig, elbow joint capsule
proximal radioulnar joint function
pronation and supination
distal radioulnar joint structure
pivot type ulnar notch of radius and head of ulna, bound by articular disc, anterior & posterior lig
proximal radioulnar joint innervation
Median, musculocutaneous, radial and ulnar nerves
distal radioulnar joint innervation
Anterior and posterior interosseous nerves
Joint of vertebral bodies structure
symphyses bw articulating surfaces by intervertebral discs
Joint of vertebral bodies function
aid in weight bearing, provided strength, shock absorbers, limited movement
Joint of vertebral bodies structure
symphyses bw articulating surfaces by intervertebral discs maintained by anterior longitudinal lig and posterior longitudinal lig
Zygapophyseal joints structure
synovial joint bw superior and inferior articular processes surrounded by thin joint capsule
attached by: ligamenta flava, interspinous, supraspinous, and intertransverse lig
Zygapophyseal joints function
gliding movements
Altlanto-occipital joint structure
synovial lateral masses of atlas and occipital condyles connected by anterior atlanto-occipital membrane and posterior atlanto-occipital membrane
Altlanto-occipital joint function
extension, flexion, small amount of lateral flexion and rotation
Zygapophyseal joints innervation
medial branch from the spinal nerve above the facet and the nerve below
Atlanto-occipital joint structure
synovial lateral masses of atlas and occipital condyles connected by anterior atlanto-occipital membrane and posterior atlanto-occipital membrane
Atlanto-occipital joint function
extension, flexion, small amount of lateral flexion and rotation
Atlanto-occipital joint innervation
C1 spinal nerve
Atlanto-axial joint Structure
plane type, inferior facets of lateral masses of atlas and superior facets of the axis
pivot joint bw dens and facet on posterior surface of the anterior arch of atlas, transverse ligament of atlas
cruciate lig, alar lig, tectorial membrane
Atlanto-axial joint function
moving head side to side
Atlanto-axial joint innervation
Ventral primary ramus of the second cervical spinal nerve
Superior tibiofibular joint structure
plane joint w/ articular fact of fibular head and articular facet on lateral tibial condyle, joint capsule
Superior tibiofibular joint function
stability ankle joint and weight bearing
Superior tibiofibular joint innervation
common fibular nerve (recurrent branch) and popliteus muscle
Inferior tibiofibular joint structure
fibrous joint bw fibula and fibular notch of tibia held together by deep interosseous tibiofibular ligament, anterior and posterior tibiofibular ligament , inferior transverse ligament
Inferior tibiofibular joint function
stability and weight bearing
Inferior tibiofibular joint innervation
deep fibular and sural nerves
Tibiotalar joint structure
hinge joint bw lateral malleolus of fibula, medial malleolus of tibia, and body/trochlea of talus bounded by anterior talofibular lig, posterior talofibular lig, calcaneofibular lig, medial lig
Tibiotalar joint function
dorsiflexion and plantarflexion
Tibiotalar joint innervation
tibial and deep fibular nerve
Subtalar joint structure
synovial joint bw posterior calcaneal articular surface of talus and posterior articular facet of calcaneus
Subtalar joint function
inversion, eversion
Transverse tarsal joint structure
synovial saddle joint talonavicular (talus and navicular) and calcaneocuboid (calcaneous and cuboid) joint
Transverse tarsal joint function
inversion and eversion
Transverse tarsal joint innervation
Talonavicular joint: deep fibular nerve, medial plantar nerve
Calcaneocuboid joint: deep fibular nerve, sural nerve, lateral plantar nerve
Intertarsal joint structure
Cuboideonavicular joint : cuboid, navicular dorsal, plantar, interosseus ligaments
Naviculocuneiform joint: navicular and cuneiform, dorsal, plantar ligaments
Intercuneiform and cuneocuboid joint: cuneiform, cuboid, dorsal, plantar, interosseus ligaments
Intertarsal joint function
gliding, rotation
Intertarsal joint innervation
Cuboideonavicular joint: deep fibular, medial plantar, lateral plantar nerves
Naviculocuneiform: deep fibular, medial plantar, lateral plantar nerves
Intercuneiform and cuneocuboid: deep fibular, medial plantar, lateral plantar nerves
Tarsometatarsal joints structure
bw tarsal and metatarsal bones, dorsal tarsometatarsal, plantar tarsometatarsal, interosseus cuneometatarsal ligaments
Tarsometatarsal joints function
flexion, extension, abduction, rotation
Tarsometatarsal joints innervation
deep fibular, medial plantar, lateral plantar nerves
Metatarsophalangeal joint structure
bw metatarsal and phalanges, plantar ligaments, deep transverse metatarsophalangeal ligaments, collateral ligaments
Metatarsophalangeal joint innervation
plantar interdigital, medial dorsal cutaneous, deep fibular nerve
interphalangeal joint structure
bw 2 phalanges, collateral ligaments
interphalangeal joint innervation
plantar interdigital nerves
Temporomandibular joint structure
modified synovial hinge joint bw mandibular fossa, articular tubercle, and head of mandible
Lig: lateral temporomandibular, sphenomandibular, stylomandibular
Temporomandibular joint function
protrusion, retrusion, elevation, depression, lateral deviation
Temporomandibular joint innervation
trigeminal nerve
Temporalis O & I
O: temporal fossa, deep surface of temporal fascia
I: coronoid process of mandible anterior border of ramus
Temporalis A & N
A: elevates and retrudes
N: deep temporal nerve
Masseter O & I
O: zygomatic arch, maxillary process of zygomatic bone
I: angle and lateral surface of ramus of mandible
Masseter A & N
A; elevates mandible, protrusion
N: masseteric
Medial pterygoid O & I
O: medial surface of lateral pterygoid plate, pyramidal process of palatine bone, tuberosity of maxilla
I: medial surface of ramus & angle of mandible
Medial pterygoid A & N
A: protrusion, side to side grinding
N: medial pterygoid
Lateral pterygoid O & I
Superior
O: infratemporal surface & crest of greater wing of sphenoid bone
I: joint capsule, articular disc
Inferior:
O: lateral surface of the lateral pterygoid plate
I: pterygoid fovea on neck of mandible
Lateral pterygoid A & N
A; depression, lateral chewing movements
N: lateral pterygoid
Tibiofemoral joint Structure
synovial hinge joint bw lateral and medial condyles of femur, tibial plateaus
lig: patellar ligament, medial and lateral patellar retinacula, tibial (medial) collateral ligament, fibular (lateral) collateral ligament, oblique popliteal ligament, arcuate popliteal ligament, anterolateral ligament (ALL), anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial meniscus, lateral meniscus
Tibiofemoral joint Function
flexion and extension
Tibiofemoral joint innervation
Femoral, tibial, common fibular, and posterior division of the obturator
Tibiofemoral joint Structure
synovial hinge joint bw lateral and medial condyles of femur, tibial plateaus
lig: patellar ligament, tibial (medial) collateral ligament, fibular (lateral) collateral ligament, oblique popliteal ligament, arcuate popliteal ligament, anterolateral ligament (ALL), anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial meniscus, lateral meniscus
Tibiofemoral joint Structure
synovial hinge joint bw lateral and medial condyles of femur, tibial plateaus
lig: patellar ligament, tibial (medial) collateral ligament, fibular (lateral) collateral ligament, oblique popliteal ligament, arcuate popliteal ligament, anterolateral ligament (ALL), anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial meniscus, lateral meniscus
Bursae: infrapatellar bursa, deep infrapatellar bursa, suprapatellar bursae, popliteus bursa, anserine bursa, gastrocnemius bursa
Tibiofemoral joint Function
flexion and extension
Patellofemoral joint innervation
Femoral, tibial, common fibular, and posterior division of the obturator
Patellofemoral joint structure
plane joint bw patellar surface of femur, posterior surface of patella, suprapatellar fat pad
lig: patellar ligament, lateral patellofemoral ligament
bursae: subcutaneous prepatellar bursa, infrapatellar bursa
Patellofemoral joint function
flexion and extension
Hip joint structure
synovial ball and socket bw head of femur covered in articular cartilage and acetabulum of pelvis, acetabular labrum, fibrous capsule, fat pad
lig: ligament of the head of the femur, transverse acetabular, iliofemoral, pubofemoral, ischiofemoral
Hip joint function
flexion, extension, abduction, adduction, medial rotation, lateral rotation, circumduction
Hip joint innervation
femoral, sciatic, obturator, superior gluteal
Ocipitofrontalis O & I
Frontal
O: epicranial aponeurosis
I: on skin superior to eyes
Occipital
O: superior nuchal line
I: epicranial aponeurosis
Ocipitofrontalis O & I
Frontal
O: epicranial aponeurosis
I: on skin superior to eyes
Occipital
O: superior nuchal line
I: epicranial aponeurosis
Orbicularis Oculi O&I
O: medial palperbral ligament and medial orbital margin and medial palpebral ligament
I: lateral palpebral ligament, and skin around orbit
Orbicularis Oculi N & A
N; temporal nerve and zygomatic
A: close eyelids gently and tightly
Orbicularis Oculi N & A
N; temporal nerve and zygomatic
A: close eyelids gently and tightly
Corrugator supercilii O & I
O: medial part of superciliary arch
I: skin of medial half of eyebrow
Corrugator supercilii N & A
N: temporal nerve
A: vertical wrinkles at root of nose
Procerus O & I
O: nasal bone
I: lower part of forehead bw eyebrows
Procerus N & A
N: zygomatic
A: depresses medial ends of eyebrows and creates transverse wrinkles
Levator labii superioris alaeque nasi O & I
O: frontal process of maxilla
I: upper lip and alar cartilage of nose
Levator labii superioris alaeque nasiN & A
N: zygomatic
A: flares nostrils & raise upper lip
Nasalis O & I
O: maxilla
I: midline aponeurosis or alar cartilage
Nasalis N & A
N: zygomatic
A: narrow or flare nostril
Orbicularis oris O & I
O: maxilla, mandible, modiolus
I: mucous membranes of lip
Orbicularis oris N & A
N: buccal
A: close mouth or protrude lips
Risorius O & I
O: parotid fascia & buccal skin
I: modiolus
Risorius N & A
N: zygomatic and buccal
A: retracts corner of mouth
Levator anguli oris O & I
O: infraorbital maxilla
I: modiolus
Levator anguli oris N & A
N: zygomatic and buccal
A: raises corners of mouth
Levator labii superioris O & I
O: infraorbital margin of maxilla
I: skin of upper lip
Levator labii superioris N & A
N: zygomatic and buccal
A: Elevates upper lip, exposes maxillary teeth
Zygomaticus major O & I
O: zygomatic bone
I: modiolus
Zygomaticus major N & A
N: zygomatic and buccal
A: elevates corner of mouth
Zygomaticus minor O & I
O: zygomatic bone
I: skin of upper lip
Zygomaticus minor N & A
N: zygomatic and buccal
A: Elevates upper lip, exposes maxillary teeth
Depressor anguli oris O & I
O: base of mandible
I: modiolus
Depressor anguli oris N & A
N: marginal mandibular
A: pulls corner of mouth downward, dilators of mouth
Depressor labii inferioris O & I
O: anterolateral body of mandible and platysma
I: skin of lower lip
Depressor labii inferioris N & A
N: marginal mandibular
A: pulls lower lip downward, dilators of mouth
Mentalis O & I
O: body of mandible
I: skin of chin
Mentalis N & A
N: marginal mandibular
A: elevates and protrudes lower lip
Platysma O & I
O: suprascapular, intrascapular, subcutaneous tissue
I: base of mandible