Myotome (upper limb)

Myotome (upper limb)

A myotome is the group of muscles that a single spinal nerve root innervates. Similarly a dermatome  is an area of skin that a single nerve innervates. In vertebrate embryonic development, a myotome is the part of a somite that develops into the muscles.

Upper Limb Myotomes

Movement Nerve Root Segments
Shoulder girdle elevation C3/4
Shoulder flexion / abduction C5
Elbow flexion C5/6
Elbow extension C7/8
Wrist flexion / extension C6/7
Finger flexion / extension C7/8
Finger abduction / adduction T1


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