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IUSM Anatomy > Nerve lesions in arm > Flashcards

Flashcards in Nerve lesions in arm Deck (10)
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1

Axillary nerve lesion

 

inability to abduct partially abducted arm beyond first 15 degrees

no sensory over lower deltoid

teres minor atrophies

2

Musculocutaneous nerve lesion

loss of biceps reflex

loss of flexion at elbow

weak supination

3

Radial nerve lesion

extensor at all arm, wrist and finger joints below shoulder

forearm supination

thumb adduction in plane of palm

loss of triceps and radial reflex

wrist drop

4

Median nerve lesion

loss of flexion, weak pronation

loss of thenar mm (can still adduct and extend)

preachers/orator's hand: index finger, thumb, and middle finger (partially) not able to flex

ape (simian) hand: thumb extended and adducted, fingers extended

5

Ulnar nerve lesion

loss of abduction and adduction of fingers

loss adduction of thumb

weak wrist flexion and adduction

claw hand: extension of distal fingers 4 and 5, flexion of distal fingers 2 and 3

6

Erb-Duchenne palsy

tearing of C5-C6 roots in motorcycle accidents, birthing, etc.

7

Klumpke's paralysis

occurs when there is an injury to C8-T1 roots (very rare)

8

C5 lesion

weakness: deltoid, infraspinatus, biceps

reflex decreased: biceps, pectoralis

sensory abnormality: shoulder, upper lateral arm

disc involved: C4-C5

9

C6 lesion

weakness: wrist extensors, biceps

reflex decreased: biceps, brachioradialis

sensory abnormality: first and second fingers, lateral forearm

disc involved: C5-C6

10

C7 lesion

weakness: triceps

reflex decreased: triceps

sensory abnormality: 3rd finger

disc involved: C6-C7