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Interval 6-9 > Upper Nerve Lesions > Flashcards

Upper Nerve Lesions Flashcards

1
Q

Cause of Lesion of Axillary nerve

A

1) fracture of surgical neck of humerus

2) dislocated humeral head

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2
Q

roots of axillary nerve

A

C5,C6

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3
Q

altered cutaneous sensation with lesion of axillary nerve

A

over deltoid insertion

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4
Q

weakness with lesion of axillary nerve

A

abduction at shoulder

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5
Q

roots of radial nerve

A

C5,6,7,8

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6
Q

where can you lesion your radial nerve?

A

1) spiral groove (lesioned by midshaft fracture of humerus)
2) compressed in axilla by incorrect use of crutch
3) deep branch can be stretched by subluxation of radius
4) dislocated humeral head

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7
Q

altered cutaneous sensation with lesion of radial nerve

A

over first dorsal interosseus, anatomic snuffbox

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8
Q

weakness with lesion of radial nerve

A

extension at wrist
extension of all fingers at MCP joints
supination
thumb extension and abduction- extensor pollicis longus and brevis and abductor pollicis longus

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9
Q

common sign of radial lesion

A

wrist drop

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10
Q

roots of the median nerve

A

C6,C7,C8, T1

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11
Q

cause of distal lesions of median nerve

A

carpal tunnel syndrome

dislocated lunate

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12
Q

cause of proximal lesions of median nerve

A

fracture of supracondylar humerus

compression between the heads of the pronator teres–> pronator teres syndrome

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13
Q

cause of lesion of recurrent branch of median nerve

A

lesioned by superficial laceration

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14
Q

cause of lesion of anterior interosseus n.

A

compression in deep forearm
chronic radial head dislocation
mass in elbow
trauma overuse

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15
Q

altered cutaneous sensation with distal lesion of median nerve

A

lateral 3.5 digits

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16
Q

altered cutaneous sensation with proximal lesion of median nerve

A

lateral 3.5 digits, thenar eminence

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17
Q

weakness with distal lesion of median nerve

A

opposition of thumb

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18
Q

weakness with proximal lesion of median nerve

A 
opposition of thumb
flexion at wrist
flexion of lateral fingers
flexion of thumb
pronation
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19
Q

common sign of distal lesion of median nerve

A

ape hand

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20
Q

common sign of proximal lesion of median nerve

A

ulnar deviation of wrist

hand of benediction- occurs when actively trying to make a fist

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21
Q

roots of ulnar nerve

A

C8,T1

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22
Q

cause of distal lesion of ulnar nerve

A

fracture of hook of hamate

lesioned by trauma to the heel of the hand

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23
Q

cause of proximal lesion of ulnar nerve

A

fracture of or trauma at medial epicondyle of humerus

fracture of clavicle

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24
Q

altered cutaneous sensation with distal lesion of ulnar nerve

A

none

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25
Q

altered cutaneous sensation with proximal lesion of ulnar nerve

A

medial 1 1/2 digits

hypothenar eminence

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26
Q

weakness with distal lesion of ulnar nerve

A

abduction and adduction of fingers
adduction of thumb
extension of fingers

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27
Q

weakness with proximal lesion of ulnar nerve

A 
abduction and adduction of fingers
adduction of thumb
extension of fingers
flexion of medial fingers
flexion at wrist
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28
Q

common sign of distal lesion of ulnar nerve

A

claw hand

29
Q

common sign of proximal lesion of ulnar nerve

A

radial deviation of wrist

30
Q

roots of musculocutaneous nerve

A

C5,6,7

31
Q

cause of lesion to musculocutaneous nerve

A

trauma

upper trunk compression

32
Q

altered cutaneous sensation with lesion of musculocutaneous

A

lateral forearm

33
Q

weakness due to lesion of musculocutaneous nerve

A

flexion at elbox

supination

34
Q

roots of dorsal scapular n.

A

C5

35
Q

muscles innervated by dorsal scapular n.

A

levator scapulae and rhomboids

36
Q

roots of long thoracic nerve

A

C5,6,7

37
Q

muscles innervated by long thoracic nerve

A

serratus anterior

38
Q

roots of suprascapular n.

A

C5,6

39
Q

muscles innervated by suprascapular n.

A

supra, infra spinatus

40
Q

roots of nerve to subclavius

A

C5,6

41
Q

muscle innervated by roots of nerve to subclavius

A

subclavius

42
Q

roots of lateral pectoral n.

A

C5-7

43
Q

muscles innervated by lateral pectoral n.

A

pec major

44
Q

roots of upper subscapular n.

A

c5,6

45
Q

muscles innervated by upper subscapular n.

A

subscapularis

46
Q

roots of thoracodorsal n.

A

C6,7,8

47
Q

muscles innervated by thoracodorsal n.

A

lat dorsi

48
Q

roots of lower subscapular n.

A

C5,6

49
Q

muscles innervated by lower subscapular n.

A

subscapularis, teres major

50
Q

roots of medial pectoral n.

A

C8,T1

51
Q

muscles innervated by medial pectoral n.

A

pectoralis major, pectoralis minor

52
Q

roots of medial brachial cutaneous n.

A

C8

53
Q

muscles innervated by medial brachial cutaneous n.

A

none (skin)

54
Q

roots of medial antebrachial cutaneous n.

A

C8,T1

55
Q

muscles innervated by medial antebrachial cutaneous n.

A

none (skin)

56
Q

motor function of musculocutaneous n.

A

biceps brachii, brachialis, coracobrachialis

57
Q

cutaneous function of musculocutaneous

A

lateral antebranchial cutaneous

58
Q

motor function of median n.

A

forearm flexors and pronators (flexor carpi radialis, palmaris longus, flexor digitorum superficialis) and pronator teres
“2LOAF” in hand

59
Q

motor function of anterior interosseus n.

A

FPL- flexor pollicis longus
FDP- flexor digitorum profundus (lateral half)
PQ- pronator quadratus

60
Q

cutaneous innervation of median n.

A

1/2 of palmar hand (lateral 3.5 digits)

61
Q

what cords does median nerve come off of?

A

lateral and medial

62
Q

what artery does median nerve travel with?

A

brachial artery between brachialis and the biceps brachii

63
Q

what are the branches of the median nerve above the elbow?

A

NONE

64
Q

sensory innervation of anterior interosseus n.

A

none

65
Q

sign for isolated anterior interosseus nerve lesion

A

ok sign

66
Q

what muscle weakness will you have if have isolated ant. interosseus nerve lesion

A

weak pronation (pronator quadratus compromised but the pronator teres is still okay)

67
Q

3 cutaneous branches of the median nerve

A

1) palmar cutaneous branch
2) radial divisions
3) ulnar divisions

68
Q

palmar cutaneous branch of the median nerve: where does it branch and what does it innervate?

A
  • branches off median nerve roughly 3 cm proximal to the wrist
  • passes superficial to the flexor retinaculum
  • innervates skin of proximal radial palm
  • any median nerve lesion distal to this branch point leaves the palmar cutaneous branch intact!
  • for ex, this nerve branches off before it can be compressed in the carpal tunnel and is consequently unaffected by carpal tunnel syndrome

Interval 6-9 (3 decks)

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