Describe the anatomical arrangement of the somatic nervous system, including the

In the somatic nervous system, a single efferent neuron runs from the central nervous system to the skeletal muscle. These motor neurons originate in the ventral horn of the spinal cord and receive input from multiple sources, including afferent neurons. A single motor neuron innervates multiple muscle fibers but each muscle is innervated by a single neuron. A motor unit describes a single motor neuron and all of the skeletal muscle fibers innervated by that neuron. Thus, when a motor neuron is activated, all of the muscle fibers innervated by that motor neuron are stimulated to contract simultaneously.