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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