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OCS Exam > Shoulder Anatomy and Brachial Plexus > Flashcards

Shoulder Anatomy and Brachial Plexus Flashcards

1
Q

Subscapularis

A

Origin: Subscapular fossa
Insertion: Lesser tuberosity
N: upper and lower subscapular N (C5/C6)
A: IR of humerus, ext, adduct, depress

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2
Q

Supraspinatus

A

O: Suprascapular Fossa
I: Superior facet of greater tuberosity
N: Suprascapular N (C5, C6)
A: Abd of humerus, ER

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3
Q

Infraspinatus

A

O: Infraspinatus fossa
I: Middle facet of greater tuberosity
N: Suprascapular N (C5, C6)
A: ER of humerus, ext

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4
Q

Teres Minor

A

O: superior lateral border of scapula
I: Inferior facet of greater tuberosity
N: Axillary Nerve (C5, C6)
A: ext and ER

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5
Q

Teres Major

A

O: Inferior lateral border, inferior angle of scapula
I: Medial intertubercular groove
N: Lower subscapular nerve (C5, C6)
A: IR, adducts arm

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6
Q

Serratus Anterior

A

O: Ext ribs 1-8
I: Medial border of anterior scapula
N: Long Thoracic Nerve (C5, 6, 7)
A: maintains scapula on thoracic wall, protracts and rotates scapula superiorly

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7
Q

Latissimus Dorsi

A

O: Spinous process of T7-T12, lumbar sp, thoracolumbar fascia, iliac crest, lower 3 ribs
I: floor of intertubercular groove
N: thoracodorsal nerve (C6,7,8)
A: IR of humerus, adduction, ext of humerus

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8
Q

Deltoid

A

O: lateral one third of clavicle, acromion, spine os scapula
I: Deltoid tuberosity of humerus (just lateral of greater tubercle)
N: Axillary Nerve (C5, C6)
A: Flexes, abducts, extends arm

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9
Q

Trapezius

A

O: spinous process of cervical and thoracic vertebrae
I: spine of scapula and acromion
N: CN XI (spinal accessory nerve), branches of ansa cervicalis
A: elevates, retracts, rotates scapula

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10
Q

Levator Scapula

A

O: Posterior tubercle of transverse processes of C1-C4
I: Sperior medial border of scapula to spine of scapulae
N: Dorsal Scapular Nerve (C5)
A: Elevates scapulae, inferior rotation of scapulae

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11
Q

Rhomboid major and minor

A

O: ligamentum nuchae, spinous process of C7-T5
I: medial border of scapulae from spine to inferior angle
A: retracts scapulae, rotates to depress scapulae
N: dorsal scapular nerve (C5)

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12
Q

Triceps

A

O: Superior one third of post and lateral humerus, inferior glenoid tubercle
I: Olecranon process
N: Radial Nerve (C5-T1)
A: elbow extension, ext arm at shoulder

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13
Q

Pectoralis Minor

A

O: Anterior surfaces of ribs 3-5 near costal cartilage
I: medial and superior coracoid process
N: Medial Pectoral Nerve (C8, T1)
A: stabilizes scapula by drawing it inferiorly and anteriorly against thoraic wall

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14
Q

Coracobrachialis

A

O: Tip of coracoid process
I: Middle medial border of humerus
N: Musculocutaneous (C5,6,7)
A: Horizontal flexion and adduction of humerus

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15
Q

Biceps Brachii

A

O: tip of coracoid and supraglenoid tubercle
I: radial tuberosity and lacertus fibrosis
N: musculocutaneous (C5, 6, 7)
A: flexes elbow and supinates forearm

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16
Q

Omohyoid

A

O: Superior border of scapula and suprascapular ligament
I: inferior hyoid bone
N; Ansa cervicalis (C1-C3)
A: functions in swallowing and phonation

17
Q

Dorsal Scapular nerve

A

Branch of C5 nerve root.

M: levator scap, rhomboid major and minor

18
Q

Long Thoracic Nerve

A

Branch of C5-7 nerve roots.
M: Serratus anterior
“C5,6,7, raise your arms to heaven”

19
Q

Suprascapular nerve

A

Branch of the upper trunk, C5, 6

M: supraspinatus, infraspinatus

20
Q

Nerve to Subclavius

A

Branch of upper trunk, C5

M: Subclavian muscle

21
Q

Lateral Pectoral Nerve

A

Branch of the lateral cord (C5,C6,C7)

M: Pec major, possibly pec minor through a communicating branch

22
Q

Upper Subscapular Nerve

A

Branch of the posterior cord (C5, C6)

M: subscapularis (upper portion)

23
Q

Lower Subscapular Nerve

A

Branch of the posterior cord (C5,C6)

M: subscapularis (lower portion)

24
Q

Thoracodorsal Nerve

A

Branch of the posterior cord (C6,7,8)
M: Latissimus Dorsi
AKA Middle subscapular nerve

25
Q

Medial Pectoral Nerve

A

Branch of the medial cord (C8, T1)
M: Pec Major, Pec minor
Pierces pec minor usually

26
Q

Medial Brachial Cutaneous Nerve

A

Branch of the medial cord (T1)

Sensory to medial and anterior humerus

27
Q

Medial Antebrachial Cutaneous Nerve

A

Branch of the medial cord (C8, T1)

Sensory to medial forearm

28
Q

Musculocutaneous nerve

A

Terminal Branch of lateral cord (C5, C6, C7)
M: coracobrachialis, brachialis, biceps brachii
Terminates as lateral antebrachial cutaneous nerve

29
Q

Axillary nerve

A

Terminal Branch of posterior cord (C5, C6)
M: Deltoid, Teres Minor
Becomes lateral brachial cutaneous nerve

30
Q

Radial nerve

A

Terminal branch of the posterior cord (C5-T1)
M: Triceps, Anconeus, supinator, brachioradialis, forearm extensors
Becomes posterior brachial cutaneous nerve

31
Q

Median Nerve

A

Terminal branches of lateral and medial cords (C5-T1)
M: Pronator Teres, Flexor Carpi Radialis, Palmaris Longus, Flexor digitorm superficialis
Anterior interosseus nerve branches off to innervate lateral half of FDP, Flexor pollicis longus, pronator quadratus, lateral 2 lumbricals
Passes through carpal tunnel

32
Q

Ulnar Nerve

A

Terminal branch of the medial cord (C7,C8,T1)

M: Flexor carpi ulnaris, medial two FDP, intrinsic hand muscles except thenar group, medial 2 lumbricals

33
Q

Upper Trunk

A

Sends posterior division to middle trunk, anterior division continues as lateral cord. Gives off suprascapular nerve and nerve to subclavius.

34
Q

middle Tunk

A

Gives anterior branch to join upper trunk and contribute to lateral cord

35
Q

lower trunk

A

Gives posterior branch to join middle trunk, continues to medial cord

36
Q

Lateral cord

A

Gives off lateral pectoral nerve, terminates as musculocutaneous nerve and branches to median nerve

37
Q

posterior cord

A

Gives off 3 nerves in this order: upper subscapular nerve, thoracodorsal nerve, lower subscapular nerve. terminates as axillary nerve and Radial nerve

38
Q

Medial cord

A

Gives off 3 branches in this order; Medial pectoral nerve, medial brachial cutaneous nerve, medial antebrachial cutaneous nerve. Terminates as ulnar nerve and branches to median nerve

OCS Exam (15 decks)

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