psychology definition of somatic nervous system
For the musician known as Somatic, see Hahn Rowe. The somatic nervous system (SoNS or voluntary nervous system) is the part of the peripheral nervous system associated with skeletal muscle voluntary control of body movements.The SoNS consists of afferent nerves and efferent nerves.hus somatic nervous system consists of three parts: 1  Spinal nerves: They are peripheral nerves that carry sensory information into and motor commands out of the spinal cord. 2  Cranial nerves: They are the nerve fibers that carry information into and out of the brain stem.