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MSK 1 > Arm and Shoulder Joint > Flashcards

Arm and Shoulder Joint Flashcards

1
Q

supraglenoid tubercle

A

attachment site for long head of biceps

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2
Q

infraglenoid tubercle

A

attachment of long head of triceps

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3
Q

articular surfaces of distal humerus

A

capitulum- lateral w/ radius

trochlea- medial w/ ulna

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4
Q

coronoid fossa vs radial fossa

A

coronoid- receives coronoid porcess of ulna during elbow flexion

radial- receives radial head during flexion

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5
Q

radial groove

A

located on posterior surface of humerus, contain radial nerve and deep brachial artery

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6
Q

ulnar groove

A

posterior of medial epicondyle for passage of ulnar nerve

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7
Q

axillary nerve wraps arond..

A

surgical neck

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8
Q

venous drainage of upper limb

A

superficial, deep, and perforating

all have valves to increase venous return

deep veins are named after accompanying arteries, usually paired around artery

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9
Q

venae communicantes

A

paired deep vein around pulsating artery, pulsation helps venous return

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10
Q

brachial fascia

A

deep fascia around arm- continuous from deltoid, pec, and axillary fascia

vacuum tight to muscle, continues into forearm as antebrachial fascia

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11
Q

septa of brachial fascia

A

medial and lateral- attach to shaft of humerus and divide arm into flexor and extensor compartments

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12
Q

3 muscles of anterior arm

A

biceps brachii, brachialis, coracobrachialis

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13
Q

biceps brachii

A

originates: short head from coracoid, long head from supraglenoid tubercle

inserts into proximal radius (radial tuberosity) and bicipital aponeurosis

flexes shoulder joint and supinates forearm and flexor of forearm

innervated by C5 and C6 via musculocutaneous

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14
Q

reason biceps can tear

A

crosses two major joints- this allows any muscle in this category to tear

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15
Q

typical cause of ruptured biceps

A

long head tear from wear or porlonged tendonitis

commonly from supraglenoid tubercle

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16
Q

brachialis

A

origin at distal 1/2 of humerus

inserts into proximal ulna, tuberosity

prime flexor of forearm

C5,6 by musculocutaneous

17
Q

coracobrachialis

A

origin coraocoid

inserts middle 1/3 of humerus

flexor and adductor of arm

also C5,6 musculocutaneous

18
Q

musculocutaneous nerve

A

terminal branch of lateral cord of BP

muscles in anterior compartment

continues as lateral cutaneous nerve of forearm

19
Q

brachial artery

A

main supply to arm, continuation of axillary

accompanies median nerve

divides into radial and ulnar arteries

20
Q

3 branches of brachial artery

A

deep profunda brachail- behind humerus in radial groove, gives rise to radial and middle collateral

superior ulnar- follows ulnar nerve

inferior ulnar collateral

all of these provide anatomosis around elbow

21
Q

triceps brachii

A

three headed origin- long from infraglenoid, lateral from posterior humerus above radial groove, medial from posterior humerus below radial groove

insert into olecranon of ulna

extensor of forearm

innervated by C6,7, 8 via radial nerve

22
Q

radial nerve

A

terminal branch of posterior cord- courses trhu radial groove on back side of humerus

innervates three heads of triceps and all extensors of forearm

give rise to posterior cutaneous nerves of arm and forearm

23
Q

damage to radial nerve presents w/

A

wrist drop from loss of innervation to forearm extensors

“saturday night palsy” from compression of radial nerve; could also be from mid shaft humerus fracture

24
Q

surgical neck fractures can damage…

A

axillary nerve, causes atrophy of deltoid and loss of shoulder contour

25
Q

right vs left lymphatic drainage

A

right- eventually right lymphatic duct

left- thoracic duct

26
Q

glenohumeral joint

A

ball and socket synovial

large humeral head articulates w/ small shallow glenoid cavity

27
Q

stabilizers of glenohumeral joint

A

glenoid labrum- ring that deepens glenoid cavity

musculotendinous rotator cuff- stabilize and hold humerus in glenoid cavity

28
Q

transverse humeral ligament

A

holds long head of biceps in bicipital groove

29
Q

glenohumeral ligaments

A

3 internal capsular ligaments strengthen anteriorly

30
Q

coracoacromial ligament

A

aka arch

extrinsic protection against superior dislocation of humeral head

31
Q

weakest aspect of shoulder joint

A

inferior, direction of injury is in anterior inferior

usually tears labrum and anterior joint capsule/subscapularis

32
Q

most of cutaneous nerves on posterior aspect of upper limb arise from…

A

radial nerve

33
Q

nerves contributing to cutaneous nerves of upper limb anteriorly

A

medial cord of BP

musculocutaneous

axillary

MSK 1 (10 decks)

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