Brachial Plexus Myotomes + Dermatomes

Question 1

C5 - myotome

Answer 1

shoulder abduction

Question 2

C6 - myotome

Answer 2

elbow flexion

Question 3

C7 - myotome

Answer 3

elbow extension

Question 4

C8 - myotome

Answer 4

grip, finger abduction/adduction

Question 5

T1 - myotome

Answer 5

none/assists with grip, finger abduction/adduction

Question 6

C5 - dermatome

Answer 6

antero-lateral shoulder + arm, postero-lateral arm and forearm

Question 7

C6 - dermatome

Answer 7

antero-lateral forearm, postero-lateral hand/wrist

Question 8

C7 - dermatome

Answer 8

lateral 2 phalanges

Question 9

C8 - dermatome

Answer 9

medial hand/phalanges

Question 10

T1 - dermatome

Answer 10

medial forearm

Question 11

anterior division fibers innervation

Answer 11

anterior arm/forearm/hand

Question 12

posterior division fibers

Answer 12

posterior arm/forearm/hand

Question 13

proximal rami (C5-C6)

Answer 13

proximal muscles

Question 14

intermediate rami (C6,C7,C8)

Answer 14

muscles act on elbow and wrist

Question 15

inferior rami (C8,T1)

Answer 15

distal (hand) muscles

Question 16

axillary nerve - sensation

Answer 16

anterior, lateral, posterior shoulder

Question 17

radial nerve - sensation

Answer 17

posterior arm, forearm, posterior lateral hand

Question 18

musculocutaneous nerve - sensation

Answer 18

lateral anterior and posterior forearm

Question 19

median nerve - sensation

Answer 19

anterior lateral hand and fingers, posterior distal digits 1-3

Question 20

ulnar nerve - sensation

Answer 20

anterior and posterior medial hand, medial side digit 4, digit 5