Nerve Root Dermatomes, Myotomes, and Reflexes

C1 Dermatome

vertex of the skull

C2 Dermatome

temple, forehead, occiput

C3 Dermatome

Entire neck, posterior cheek, temporal area, prolongation forward under mandible

C4 Dermatome

shoulder area, clavicular area, upper scapular area

C5 Dermatome

Deltoid area, anterior aspect of entire arm to base of the thumb

C6 Dermatome

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

C7 Dermatome

lateral arm and forearm to index, long and ring fingers

C8 Dermatome

Medial Arm and forearm to long, ring and little fingers

T1 Dermatome

Medial side of the forearm to base of little finger

T2 Dermatome

medial side of upper arm to medial elbow, pectoral and midscapular areas

C2 Myotome

longus colli, sternocleidomastoid, rectus capitus

C3 Myotome

trapexiius, splenius capitis

C4 Myotome

Trapexius, levator scapulae

C5 myotome

supraspinatus, infraspinatus, deltoid, biceps

C6 myotome

biceps, supinator, wrist extensors

C7 Myotome

triceps, wrist flexors

C8 myotome

ulnar deviators, thumb extensors, finger flexors

T1 Myotome

Abduction/adduction of fingers

Biceps Reflex

C5-C6 Musculocutaneous

Triceps Reflex

C7-C8 Radial

Brachioradialis Reflex

C5-C6 Radial nerve