Nerve Root Dermatomes And Myotomes

Question 1

C1

Answer 1

D= vertex of skull
M= none

Question 2

C2

Answer 2

D= temple, forehead, occipital
M = longus colli, SCM, rectus capitis

Question 3

C3

Answer 3

D= entire neck, posterior check, temporal area, prolongation forward under mandible
M = trap, splenius capitis

Question 4

C4

Answer 4

D=shoulder area, clavicular area, upper scapula area
M= trap, levator scapula

Question 5

C5

Answer 5

D=deltoid area, anterior aspect of entire arm to base of thumb
M=supraspinatus, Infraspinatus, deltoid, bicep

Question 6

C6

Answer 6

D= Anterior arm, radial side of hand to thumb and index finger
M= biceps, supinator, wrist extensors

Question 7

C7

Answer 7

D= lateral arm and forearm to index, long, ring finger
M= triceps, wrist extensors

Question 8

C8

Answer 8

D= medial arm and forearm to long ring and little finger
M= ulnar deviations, thumb extensors, finger flexors

Question 9

T1

Answer 9

D= 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-T12

Answer 11

T3-T6 = upper thorax
T5-T7 = costal margin
T8-T12 = abdomen and lumbar region

Question 12

L1

Answer 12

D= back over trochanter and groin

Question 13

L2

Answer 13

D= back, front of thigh to knee
M= psoas and hip adductors

Question 14

L3

Answer 14

D= back, upper buttock, anterior thigh and knee, medial lower leg
M = Psoas, quads

Question 15

L4

Answer 15

D= medial buttock, lateral thigh, medial leg, dorsum of foot and big toe
M= tib ant, extensor hallucis

Question 16

L5

Answer 16

D= buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot medial half of sole first second and third toes
M= extensor hallucis, perineal, glut med, dorsiflexion, hamstrings, plantar flexors

Question 17

S1

Answer 17

D=Lateral and plantar aspect of foot
M= hamstrings, gluteals, perineal, plantar flexors

Question 18

S2

Answer 18

D= buttock, thigh, posterior leg
M= same as S1 except peroneals

Question 19

S3

Answer 19

D= groin posteriomedial thigh to knee

Question 20

S4

Answer 20

D= perineum, genitals, lower sacrum
M= bladder, rectum