Upper Extremity Nerves

Question 1

What nerve roots make Axillary Nerve?

Answer 1

C5-C6

Question 2

What nerve roots make Musculocutaneous Nerve?

Answer 2

C5-C7

Question 3

What nerve roots make Radial Nerve?

Answer 3

C5-T1

Question 4

What nerve roots make Median Nerve?

Answer 4

C5-T1

Question 5

What nerve roots make Ulnar Nerve?

Answer 5

C8-T1

Question 6

What nerve roots make recurrent branch of Median nerve?

Answer 6

C5-T1

Question 7

Fractured surgical neck of humerus; anterior dislocation of humerus. What nerve?

Answer 7

Axillary

Question 8

Upper trunk compression. What nerve?

Answer 8

Musculocutaneous

Question 9

Midshaft fracture of humerus; compression of axilla, eg, due to crutches or sleeping with arm over chair (“Saturday night palsy”). What Nerve?

Answer 9

Radial

Question 10

Supracondylar fracture of humerus (proximal lesion); carpal tunnel syndrome and wrist laceration (distal lesion). What nerve?

Answer 10

Median

Question 11

Fracture of medial epicondyle of humerus “funny bone” (proximal lesion); fractured hook of hamate (distal lesion)

Answer 11

Ulnar

Question 12

Superficial laceration of palm

Answer 12

Recurrent branch of median nerve

Question 13

Flattened deltoid
Loss of arm abduction at shoulder (> 15 degrees) Loss of sensation over deltoid muscle and lateral
arm

Answer 13

Axillary Nerve

Question 14

Loss of forearm flexion and supination Loss of sensation over lateral forearm

Answer 14

Musculocutaneous

Question 15

Wrist drop: loss of elbow, wrist, and finger extension
decreased grip strength (wrist extension necessary for maximal action of flexors)
Loss of sensation over posterior arm/forearm and dorsal hand

Answer 15

Radial Nerve

Question 16

“Ape hand” and “Pope’s blessing”
Loss of wrist flexion, flexion of lateral fingers,
thumb opposition, lumbricals of 2nd and 3rd
digits
Loss of sensation over thenar eminence and
dorsal and palmar aspects of lateral 3 1⁄2 fingers
with proximal lesion
Tinel sign (tingling on percussion)

Answer 16

Median Nerve

Question 17

“Ulnar claw” on digit extension
Radial deviation of wrist upon flexion (proximal
lesion)
Loss of wrist flexion, flexion of medial fingers,
abduction and adduction of fingers (interossei),
actions of medial 2 lumbrical muscles Loss of sensation over medial 1 1/2 fingers including hypothenar eminence

Answer 17

Ulnar Nerve

Question 18

“Ape hand”
Loss of thenar muscle group: opposition,
abduction, and flexion of thumb
No loss of sensation

Answer 18

Recurrent Branch of Median Nerve