Damage - clinical significance

Question 1

Musculocutaneous nerve

Answer 1

weak elbow flexion and weak forearm supination

Question 2

Axillary nerve

Answer 2

numbness over sergeant’s patch and weakness of shoulder abduction, deltoid wasting and weakness of shoulder flexion, extension and external rotation

Question 3

Median nerve

Answer 3

numbness of median nerve distribution to the hand, wasting of thenar eminence, weak grip strength and hand of benediction deformity due to inability to flex the index or middle fingers

Question 4

Radial nerve

Answer 4

loss of innervation to the muscles of the posterior arm and forearm, numbness of radial nerve distribution and a wrist drop deformity with very weak extension of the elbow, wrist and fingers

Question 5

Ulnar nerve

Answer 5

numbs in the ulnar distribution to the hand, wasting of the hypothenar ambience and intrinsic muscles of the hand, a claw hand deformity due to an inability to extend the ring and little fingers, and weak finger abduction and adduction