myotome C5
Elbow flexion; shoulder abduction
myotome C6
Wrist Extension
myotome C7
Elbow extension
myotome C8
finger flexion; distal phalanx of middle finger
myotome T1
finger abduction; little finger
Dermatome C2
posterior half of skull
dermatome C3
medial end of clavicle
dermatome C4
medial acromion and below clavicle
dermatome C5
lateral elbow (and lateral acromion)
dermatome C6
1st digit & 2nd digit
dermatome C7
3rd digit
dermatome C8
5th digit (and 4th digit)
dermatome T1
medial elbow