Myotome

A myotome is the group of muscles that a single spinal nerve innervates.

[1] Similarly a dermatome is an area of skin that a single nerve innervates with sensory fibers.

The anatomical term myotome which describes the muscles served by a spinal nerve root, is also used in embryology to describe that part of the somite which develops into the muscles.

A group of muscles innervated by the motor fibres of a single nerve root is known as a myotome.

[4] Myotome distributions of the upper and lower extremity are as follows;[5][6] In humans myotome testing can be an integral part of neurological examination as each nerve root coming from the spinal cord supplies a specific group of muscles.