Dermatome Testing

Posterior head

C2

Posterior-lateral neck

C3

Acromioclavicular joint

C4

Lateral arm

C5

Lateral forearm and thumb

C6

Palmar distal phalanx-middle finger

C7

Little finger and ulnar border of the hand

C8

Medial forearm

T1

Anterior thigh

L2

Middle third of anterior thigh

L3

Patella and medial malleolus

L4

Fibular head and dorsum of foot

L5

Lateral and plantar aspect of foot

S1

Medial aspect of posterior thigh

S2

Perianal area

S3-S5