Muscles that move the elbow are innervated mainly by spinal nerves from spinal cord levels C6 and C7.
Muscles in the hand are innervated mainly by spinal nerves from spinal cord levels C8 and T1.
Visceral part of the nervous system
The visceral part of the nervous system, as in the somatic part, consists of motor and sensory components:
Sensory nerves monitor changes in the viscera.
Motor nerves mainly innervate smooth muscle, cardiac muscle, and glands.