Upper Limb Nerve Lesions Flashcards Preview

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Flashcards in Upper Limb Nerve Lesions Deck (25):
1

upper trunk compression (Erb-Duchenne syndrome) and herniation of disk between C4 and C5 can cause C5 root lesion. what is the location of the dermatome affected? what muscles are affected?

posterior shoulder, upper lateral arm

deltoid, rotator cuff, biceps, brachioradialis

2

upper trunk compression (Erb-Duchenne syndrome) and herniation of disk between C5 and C6 can cause C6 root lesion. what is the location of the dermatome affected? what muscles are affected?

lateral forearm, thenar eminence, dorsal and palmar sides of the thumb and index finger

biceps, brachiradialis, brachialis, supinator

3

what reflex is suppressed with a lesion to root C5 or C6?

biceps tendon

4

cervical spondylosis or herniation of disk between C6 and C7 can cause lesion of root C7. what is the location of the dermatome affected? what muscles are affected?

midpalm, dorsal and palmar sides of middle finger

latissimus dorsi, pectoralis major, triceps, wrist extensors

5

what reflex is suppressed with lesion to root C7?

triceps tendon

6

a lower trunk compression by cervical rib or pancoast tumor (Klumpke's paralysis) can cause lesion to root C8. what is the location of the dermatome affected? what muscles are affected?

hypothenar eminence, dorsal and palmar sides of ring and little finger

finger flexors, wrist flexors, intrinsic hand muscles

7

a lower trunk compression by cervical rib or pancoast tumor (Klumpke's paralysis) can cause lesion to root T1. what is the location of the dermatome affected? what muscles are affected?

medial arm and medial forearm to wrist

intrinsic hand muscles

8

what can cause a lesion to the axillary nerve (C5, C6)?

fracture of surgical neck of humerus, dislocated humeral head

9

a lesion to axillary nerve causes altered cutaneous sensation where? and weakness of what muscle actions?

over deltoid insertion

abduction at shoulder

10

what can cause a lesion to the radial nerve (C5-C8)?

fracture midshaft of humerus, subluxation of radial head, dislocated humeral head, dislocated humeral head, compression in axilla

11

a lesion to radial nerve causes altered cutaneous sensation where? and weakness of what muscle actions?

over first dorsal interosseous, anatomic snuffbox

extension at wrist, extension of all fingers at MP joint, supination, thumb extension and abduction

12

wrist drop is a common sign of lesion to what nerve?

radial nerve

13

ape hand is a common sign of a lesion to what nerve?

distal lesion to median nerve

14

what are common causes of distal lesions to the median nerve (C6-T1)?

carpal tunnel syndrome, dislocated lunate

15

a distal lesion to the median nerve causes altered cutaneous sensation where? and weakness of what muscle actions?

lateral 3 1/2 digits

opposition of thumb

16

ulnar deviation of wrist and hand of benediction are common sign of lesions to what nerve?

proximal lesion to median nerve

17

what are common causes of proximal lesions to the median nerve?

fracture of supracondylar humerus, compression between heads of pronator teres

18

a proximal lesion to the median nerve causes altered cutaneous sensations where? and weakness of what muscle actions?

lateral 3 1/2 digits, thenar eminence

distal muscles and flexion at wrist, flexion of lateral fingers, flexion of thumb, pronation

19

claw hand is a common sign of lesion to what nerve?

distal lesion to ulnar nerve, and proximal lesion to ulnar nerve

20

what is a common cause of a distal lesion to the ulnar nerve (C8, T1)?

fracture of hook of hamate

21

a distal lesion to the ulnar nerve causes altered cutaneous sensation where? and weakness of what muscle actions?

medial 1 1/2 digits, hypothenar eminence

abduction and adduction of fingers, adduction of thumb (ex. holding paper between fingers), extension of fingers

22

radial deviation of wrist is a common sign of lesion to what nerve?

proximal lesion to ulnar nerve

23

what are common causes of proximal lesions to the ulnar nerve?

fracture of or trauma at medial epicondyle of humerus, fracture of clavicle

24

a proximal lesion to the ulnar nerve can cause altered cutaneous sensation where? and weakness of what muscle actions?

medial 1 1/2 digits, hypothenar eminence

distal muscles and flexion of medial fingers, flexion at wrist

25

trauma and upper trunk compression can cause lesion to musculocutaneous nerve (C5-C7). where are sites of altered cutaneous sensation? what muscle actions are weakened?

lateral forearm

flexion at elbow, supination