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