UE Dermatomes, Myotomes and Reflexes

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Nerve Root

Dermatome

Myotome

Reflex

lateral arm; deltoid tuberosity

deltoid & biceps (elbow flexion)

biceps (cubital fossa)

lateral forearm

wrist extensors (wrist extension)

brachioradialis (distal radius)

middle finger, middle posterior forearm

triceps (elbow extension), wrist flexors (wrist flexion)

triceps (olecranon fossa)

4th & 5th digits

finger flexion and ADD

NONE

medial forearm (medial epicondyle)

finger ABD

NONE

medial aspect of arm (biceps)

NONE