Nerves

Question 1

Musculocutaneous

Answer 1

lat. cord within ax –> through coracobrachialis belly (INJURY SITE) –> cubital fossa as lat. cut.
N. of forearm

NM: Ant. comp. arm

NS: Top of brach.

C5, C6, C7

Question 2

Axillary

Answer 2

post. cord –> post. ax. –> quad. ax. space –> post. hum. neck –> surg. neck (INJURY SITE=delt. atrophy)

NM: delt, teres minor

NS: skin lat. shoulder/top delt.

C5, C6

Question 3

Radial

Answer 3

post cord –> post. ax –> inf. to quad. ax. space –> post. aspect of hum. shaft –> rad. groove of hum. (INJURY SITE=wrist drop)

lat. to cub. fossa

NM: ext. post. arm, ext. post. forearm, brachioradialis, supinator (DEEP BRANCH)

SM: post. arm, forearm, hand. Dorsal surface of digits 1, 2, 3, half of 4 (post. cut. N. forearm, low. lat. cut. nerve arm) (SUPERFICIAL BRANCH)

C5, C6, C7, C8, T1

Question 4

Median

Answer 4

lat. AND med. cords –> inf. ax. –> antero-medial arm w/muscles –> ant. elbow in cub. fossa (INJURY SITE: ape hand) –> ant. forearm –> hand via carpal tunnel (MOST COMMON INJURY SITE)

NM: ant. forearm and hand. flex. wrist, pron. forearm, flex. 1,2,3, lumbs. 1,2, thenar,

SM: palm. digs. 1, 2, 3 and lat. half of 4
dorsal tips 1,2,3, half of 4

C5 - C8, T1

Question 5

Ulnar

Answer 5

med. cord –> inf. from ax. –> antero-medial arm (protected by muscle) –> post. to med. epicondyle (INJURY SITE: ulnar claw hand) –> med. forearm –> hand ext. of carpal tunnel

NM: med. forearm and hand, med. half flex. dig. prof., hand int. lumb. 3 & 4, hypothenar, palm. & dorsal interossei, flex. carp. uln

NS: Palm. & dors. med. half dig. 4, all of dig. 5
C8, T1

** So much back up in forearm so injury won’t show much, but loss of hand function more significant **