Myotomes and Dermatomes

Question 1

C2

Answer 1

back of the head, cervical flexion

Question 2

C3

Answer 2

back of the neck, lateral neck flexion

Question 3

C4

Answer 3

upper trap, shoulder elevation

Question 4

C5

Answer 4

upper lateral shoulder (deltoid), arm abduction

Question 5

C6

Answer 5

lateral arm to the thumb, elbow flexion and wrist extension

Question 6

C7

Answer 6

back of the arm to fingers 2-3, elbow extension and wrist flexion

Question 7

C8

Answer 7

medial arm to fingers 4-5, thumb extension/opposition

Question 8

T1

Answer 8

armpit, antero/medial arm, finger abduction

Question 9

Axillary nerve

Answer 9

lateral shoulder similar to C5, deltoids

Question 10

Radial nerve

Answer 10

back of arm and hand to fingers 1-3, wrist and hand extensors, triceps, brachioradialis

Question 11

Musculocutaneus nerve

Answer 11

anteromedial lower arm, biceps brachii, coracobrachialis, brachialis

Question 12

Ulnar nerve

Answer 12

front and back of lateral hand and pinky finger, wrist and finger flexors

Question 13

Median nerve

Answer 13

front of hand and fingers 1-4, pronators

Question 14

Suprascapular nerve

Answer 14

superior shoulder, supraspinatus, infraspinatus

Question 15

L1

Answer 15

proximal thigh/hip, hip flexion

Question 16

L2

Answer 16

middle thigh, hip flexion

Question 17

L3

Answer 17

distal thigh, knee extension

Question 18

L4

Answer 18

medial lower leg, dorsiflexion

Question 19

L5

Answer 19

anterior lower leg to toes, great toe extension

Question 20

S1

Answer 20

lateral foot, plantar flexion

Question 21

S2

Answer 21

back of lower leg and bottom of foot