Innervations of Terminal Branches

Question 1

Axillary n

Answer 1

Motor: deltoid and teres minor mm
Sensory: Lateral cutaneous n. of arm (a.k.a. lateral brachial cutaneous n.

Question 2

Radial n

Answer 2

Motor: Triceps and posterior forearm extensors
Sensory: superficial cutaneous branch of radial n (posterior hand, thumb, IF, MF)

Question 3

Musculocutaneous n

Answer 3

Motor: Biceps, brachial mm, coracobrachialis m.
Sensory: lateral cutaneous n. of forearm (a.k.a. lateral antebrachial cutaneous n) for anterier-lateral forearm

Question 4

Median n

Answer 4

Motor: forearm flexors, thenar mm. (PT, FCR, PL, FDS, radial 1/2 of FDP, FPL, intrinsic thumb, 1st and 2nd lumbricles)
Sensory: superficial cutaneous branch of median n (volar hand, thumb, IF, MF, 1/2 RF, dorsal tip thumb, IF, MF, 1/2 RF)

Question 5

Ulnar n

Answer 5

Motor: FCU, ulnar 1/2 of FDP, intrinsic hand mm (hypothenar, 3rd and 4th lumbrical mm., palmar interosseous mm (PADs), dorsal interosseous mm (DABs)
Sensory: superficial cutaneous branch of ulnar n. (SF and 1/2 of RF)