3.3- Dermatomes and Myotomes

Dermatomes

areas of skin that are innervated by sensory nerves from specific levels of spinal cord

c3

neck, head/face, upper shoulder

c4

shoulder, upper scapular and clavicular area

c5

deltoid area, anterior entire arm to base of thumb

c6

anterior arm, radial side of hand to thumb and index finger

c7

lateral arm and forearm to index, long and ring fingers

c8

medial arm and forearm to long, ring and little fingers

t1

medial side of forearm to base of little fingers

t2

medial side of upper arm to medial elbow, pectoral and mid scapular areas

t3-6

upper thorax

t5-7

costal margin

t8-12

abdomen and lumber region

L1

back, over trochanter and groin

L2

back, front of thigh to knee

L3

back, upper buttock, anterior thigh and knee, medial lower leg

L4

medial buttock, later high, medial leg, dorsal of foot, big toe

L5

Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes