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MSK Exam II > Shoulder region and Brachium and Cubital Fossa > Flashcards

Shoulder region and Brachium and Cubital Fossa Flashcards

1
Q

Origin and insertion of deltoid

A

origin: lateral 1/3 anterior border of clavicle, acromion, spine of scapula
insertion: deltoid tuberosity

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2
Q

What is the action of deltoid

A

abduction after it has begun
anterior- flexes and medially rotates
middle- abduction only
posterior- extends and laterally rotates

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3
Q

What innervates deltoid

A

Axillary n

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4
Q

What is located directly deep to deltoid m

A

subdeltoid or subacromial bursa

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5
Q

What rotator cuff is most prone to injury

A

supraspinatus

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6
Q

origin and insertion of supraspinatus

A

origin: supraspinous fossa of scapula
insertion: highest facet on posterior surface greater tubercle of humerus

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7
Q

What is the action of supraspinatus

A

initiates abduction of the humerus

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8
Q

What innervates supraspinatus

A

suprascapular nerve

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9
Q

What initiates abduction of humerus

A

supraspinatus m

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10
Q

origin and insertion of infraspinatus

A

origin: infraspinous fossa of scapula
insertion: middle facet on posterior surface of greater tubercle of humerus

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11
Q

What is the action of infraspinatus

A

lateral rotation of humerus

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12
Q

What innervates infraspinatus

A

suprascapular n

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13
Q

What runs in the suprascapular notch

A

the supra scapular n

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14
Q

What runs over the suprascap notch

A

suprascap artery

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15
Q

where is the superior transverse scap ligament

A

closes top of suprascap notch

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16
Q

origin and insertion of teres minor

A

origin: middle 1/3 to upper 2/3 of lateral border of scapula
insertion: lowest facet on the posterior surface of the greater tubercle of the humerus

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17
Q

what is the action of teres minor

A

lateral rotation of the humerus

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18
Q

what innervates teres minor

A

axillary n

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19
Q

What tendons assist in strengthening the gelnohumeral joint

A

supraspinatus, infraspinatus and teres minor

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20
Q

origin and insertion of teres major

A

origin: dorsal surface of the inferior angle of scapula
insertion: crest of lesser tubercle of humerus

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21
Q

What is the action of teres major

A

extension, adduction and medial rotation of humerus

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22
Q

What innervates teres major

A

lower subscapular n

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23
Q

origin and insertion of subscapularis

A

origin: subscapular fossa
insertion: lesser tubercle of humerus

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24
Q

what is the action of subscapularis

A

medial rotation of humerus

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25
Q

what innervates subscapularis

A

upper and lower subscapular n

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26
Q

what are the rotator cuff m

A

subscapularis, supraspinatus, infraspinatus, teres minor

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27
Q

origin and insertion of serratus anterior

A

origin: outer surfaces of ribs 1-8 or9
insertion: vertebral costal surface of scapula from superior to inferior angle

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28
Q

What is the action of serratus anterior

A

protracts scapula, upwardly rotates the glenoid cavity, fixates scapula to thoracic wall

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29
Q

what innervates serratus anterior

A

long thoracic n

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30
Q

what function is serratus anterior an accessory m for

A

respiration when in supinated

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31
Q

What is characterized condition of injury to long thoracic n

A

elevation of scapula away from body along medial border and inferior angle “winged scapula”, inability to abduct the upper limb

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32
Q

What spaces are created by the long head of triceps

A

quadrangular and triangular

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33
Q

what are the borders of the quandrangular space in upper arm

A

superior- teres minor
inferior- teres major
lateral- humerus
medial- long head of triceps

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34
Q

What are the contents of the quandrangular space

A

axillary nerve

posterior humeral circumflex a

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35
Q

what are the borders of the triangular space in upper limb

A

superior- teres minor
inferior- teres major
lateral- long head triceps

36
Q

what are the contents of the triangular space in upper limb

A

circumflex scapular a

37
Q

what arteries are involved in scapular anastomoses

A

deep branch transverse cervical a, suprascap, acromial branch, circumflex scapular a, thoracodorsal a, ant and post humeral circumflex aa

38
Q

What aa branch from third portion of axillary a

A

circumflex scap
thoracodorsal
ant and post humeral circumflex aa

39
Q

Where does suprascap a come off from

A

thyrocervical trunk off subclavian a

40
Q

what anastomoses with the circumflex scapular and thoracodorsal aa

A

the branches from thyrocervical trunk

transverse cervical and suprascapular

41
Q

what does the acromial branch of thoracoacromial a anstomose with?

A

the ant and post humeral circumflex aa

42
Q

what aa anastomose with branches of intercostal aa

A

deep transverse cervical aa

43
Q

what is the brachial fascia continuous with

A

fascia of shoulder mm above and with antebrachial fascia below

44
Q

What is enclosed in the medial intermuscular septum

A

brachial a, vv, median n, musculocutaneous n and ulnar n

45
Q

what are the anterior compartment mm

A

brachialis, biceps brachii, coracobrachialis

46
Q

What are the 3 primary forearm flexors

A

biceps brachii, brachialis, brachioradialis

47
Q

Origin and insertion of biceps brachii

A

origin long head: supraglenoid tubercle of scapula
origin short head: coracoid process of scapula
insertion: common tendon to radial tuberosity and bicipital aponeurosis

48
Q

what is the action of biceps brachii

A

flexes forearm and supinates hand. MOST powerful supinator above 90 degrees of flexion
long head assists in flexing arm

49
Q

what innervates biceps brachii

A

musculocutaneous

50
Q

origin and insertion of brachialis

A

origin: distal half of the anterior surface of humerus
insertion: coronoid process and tuberosity of the ulna

51
Q

what is the action of brachialis

A

flexion of forearm MOST powerful flexor

52
Q

what innervates brachialis

A

musculocutaneous

53
Q

origin and insertion of brachioradialis

A

origin: lateral supracondylar ridge of humerus
insertion: lateral radius at base of styloid process

54
Q

action of brachioradialis

A

flexion of forearm (midway supination)

55
Q

origin and insertion of coracobrachialis

A

origin: coracoid process of scapula
insertion: middle third, medial surface of humerus

56
Q

what is the action of coracobrachialis

A

flexion, adduction of humerus

57
Q

innervation of coracobrachialis

A

msuculocutaneous

58
Q

innervation of brachioradialis

59
Q

origin of the tricep heads

A

long head- infraglenoid tubercle of scapula
lateral head- posterior surface of humerus proximal to radial groove
medial head- posterior surface of humerus distal to radial groove

60
Q

insertion of triceps brachii

A

posterior surface olecranon process of ulna

61
Q

action of triceps brachii

A

all heads act to extend the forearm

62
Q

what is the specific action of long head triceps

A

extends and adducts arm at shoulder joint

63
Q

what innervates triceps brachii

64
Q

origin and insertion of anconeus

A

origin: posterior surface lateral epicondyle of humerus
insertion: lateral surface of olecranon and proximal posterior surface of ulna

65
Q

What is the action of anconeus

A

assists triceps in extension of forearm

66
Q

what innervates anconeus

67
Q

Where are the borders of brachial a

A

starts distal to inferior border of teres major and ends in cubital fossa where it splits

68
Q

what are the branches of brachial a

A

profunda brachial- posteromedial and divides into middle and radial collateral aa
superior ulnar collateral- medial aspect mid portion(anastomoses with posterior ulnar recurrent a)
inferior ulnar collateral- medial aspect distal portion (anastomoses with anterior ulnar recurrent a)

69
Q

What are the superficial vv in the upper limb

A

cephalic and basilic

70
Q

what tributaries become cephalic and where does it go

A

lateral dorsum of hand (dorsal venous arch) goes superior to forearm along lateral surface.
courses between deltoid and pectoralis major mm
pierces costocoracoid membrane to join axillary vein

71
Q

what tributaries become basilic and where does it go

A

medial dorsum of hand (dorsal venous arch), ascends posterormedial forearm to medial surface arm and pierces brachial fascia at midportion

72
Q

what joins the basilic and cephalic together

A

median cubital vein

73
Q

what are the deep vv of the brachium

A

brachial vv that are formed by union of radial and ulnar vv that parallel brachial a

74
Q

where does basilic v join brachial vv

A

inferior border of teres major m

75
Q

What nerves run in the brachium

A

median, ulnar, musculocutaneous and radial

76
Q

What nerves give off branches to supply mm in brachium

A

musculocutaneous (flexors) radial (extensors)

77
Q

what nerves give off branches in elbow joint

A

all the nerves

78
Q

what cord levels does ulnar nerve contain

79
Q

what are the cord levels in median nerve

A

C6 C7 C8 T1

80
Q

what are the cord levels in radial nerve

A

C5 C6 C7 C8 T1

81
Q

what are the cord levels in musculocutaneous

82
Q

what are the boundaries of the cubital fossa

A

lateral: brachioradialis m
medial: pronator teres m
superior: a line drawn through both humeral epicondyles
roof: deep fascia
floor: brachialis and supinator m

83
Q

contents of cubital fossa

A

T: tendon of the biceps
A: brachial a dividing radial and ulnar aa
N: median n
lateral to medial

84
Q

what structures lay superficial to cubital fossa

A

median cubital vein and lateral antebrachial cutaneous n

85
Q

what structures are deep to the cubital fossa

A

bifurcation of the radial n into superficial and deep

MSK Exam II (10 decks)

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