Brachial Plexus Anatomy Flashcards

1
Q

What does the long thoracic nerve innervate

A

Serratus anterior

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2
Q

NCS findings in plexopathy that distinguishes injury proximal vs distal to DRG

A

Proximal - SNAP is preserved, but CMAP is abnormal

Distal - decreased SNAP

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3
Q

What muscles does musculocutaneous nerve innervate

A

Brachialis, biceps, coracobrachialis

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4
Q

What nerves come off the medial cord?

A

Medial brachial and antebrachial cutaneous nerves

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5
Q

What makes up the musculocutaneous branch?

A

Lateral cord

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6
Q

What does the upper subscapular nerve innervate

A

Subscapularis

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7
Q

Where does suprascapular nerve branch from

A

Upper trunk

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8
Q

Nerve root innervation for subscapularis

A

C5,6,7

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9
Q

What is nerve root innervation for pectoralis minor

A

C8,T1

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10
Q

What does the medial pectoral nerve innervate

A

Pectoralis major and pectoralis minor

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11
Q

What makes up the medial cord of the brachial plexus?

A

The anterior division of the lower trunk

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12
Q

2 nerves off the roots

A

Dorsal scapular nerve and long thoracic nerve

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13
Q

What does the lateral pectoral nerve innervate

A

Lateral portion of pectoralis major

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14
Q

2 nerves off the divisions

A

Medial and lateral pectoral nerve

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15
Q

Pectoralis major nerve root innervation

A

C5,6 (lateral pectoral nerve) and C7,8,T1 (medial pectoral nerve)

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16
Q

What makes up the axillary branch

A

Posterior cord

17
Q

What makes up the radial branch

A

Posterior cord

18
Q

What makes up the median branch

A

Lateral and medial cord

19
Q

Where does long thoracic nerve branch from

A

C5,6,7 nerve roots

20
Q

Nerves off the posterior cord

A

Upper, medial (thoracodorsal) and lower subscapular nerves

21
Q

What does the dorsal scapular nerve innervation

A

Rhomboids and levator scapulae muscle

22
Q

What innervates the supinator

A

Radial nerve

23
Q

What innervates adductor pollicis

A

Ulnar nerve

24
Q

The ventral rami of the brachial plexus go between what 2 muscles

A

Anterior and middle scalene muscles

25
Q

What makes up the posterior cord of the brachial plexus

A

Posterior divisions of upper, middle and lower trunks

26
Q

What does the suprascapular nerve innervate

A

Supraspinatus and infraspinatus

27
Q

Nerve root innervation for latissimus dorsi

A

C6,7,8

28
Q

What does the middle subscapular nerve innervate

A

Latissimus dorsi

29
Q

What muscles does axillary nerve innervate

A

Deltoid, teres minor

30
Q

What does the lower subscapular nerve innervate

A

Teres major and subscapularis

31
Q

Nerve root innervation for supraspinatus and infraspinatus

A
supraspinatus = C4,5,6
Infraspinatus = C5,6
32
Q

Nerve root innervation for teres major

A

C5,6

33
Q

Where does dorsal scapular nerve branch from

A

C5 root

34
Q

What innervates abductor pollicis longus

A

Radial nerve

35
Q

1 nerve off the trunks

A

Suprascapular nerve

36
Q

What makes up the lateral cord of the brachial plexus

A

The anterior divisions of the upper and middle trunks

37
Q

What makes up the ulnar branch

A

Medial cord