Dermatomes

Question 1

C1

Answer 1

vertex of skull.

Question 2

C2

Answer 2

temple, forehead, occiput. myotome: longus colli, SCM, rectus capitis

Question 3

C3

Answer 3

entire neck, posterior cheek, temporal area, prolongation forward under mandible. myotome: trap, splenius capitis

Question 4

C4

Answer 4

shoulder area, clavicular and upper scap area. myotome: trap, levator scapulae

Question 5

C5

Answer 5

deltoid area, anterior aspect of entire arm to base of thumb. myotome: supraspinatus, deltoid, biceps

Question 6

C6

Answer 6

anterior arm, radial side of hand to thumb and index finger. myotome: biceps, supinator, wrist extensors.

Question 7

C7

Answer 7

lateral arm and forearm to index, long and ring fingers. myotome: triceps, wrist flexors

Question 8

C8

Answer 8

medial arm and forearm to long, ring and little fingers. myotome: ulnar deviators, thumb extensors, thumb adductors

Question 9

T1

Answer 9

medial side of forearm to base of little finger.

Question 10

T2

Answer 10

medial side of upper arm to medial elbow, pectoral and midscapular areas

Question 11

T3-6

Answer 11

upper thorax

Question 12

T5-7

Answer 12

cotal margin

Question 13

T8-12

Answer 13

abs and lumbar region

Question 14

L1

Answer 14

back, over trochanter and groin

Question 15

L2

Answer 15

back, front of thigh to knee. myotome: psoas, hip adductors

Question 16

L3

Answer 16

back, upper buttock, anterior thigh and knee, medial lower leg. myotome: psoas ,quads, thigh atrophy

Question 17

L5

Answer 17

buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first second and third toes. myotome: extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstring and calf atrophy

Question 18

S1

Answer 18

buttock, thigh and posterior leg. myotome: calf and hamstring, wasting of gluteals, peorneals, PFs

Question 19

S2

Answer 19

same as S1. mytome: same as S1 except peroneals

Question 20

S3

Answer 20

groin and medial thigh to knee.

Question 21

S4

Answer 21

perineum, genitals, lower sacrum. myotome: bladder, rectum

Question 22

L4

Answer 22

medial buttock, lateral thigh, medial leg, dorsum of foot, big toe. myotome: tib anterior, extensor hallicus