C5
Shoulder abduction
C6
Elbow flexion/wrist flexion
C7
Elbow extension/wrist flexion
C8
Wrist/finger flexion
T1
Finger abduction
C5
Lateral shoulder to elbow
C6
Lateral forearm to thumb and index finger
C7
Posterior forearm to middle finger
C8
Medial forearm to pinky/ring finger
T1
Medial upper arm to chest