The somatic nervous system, or voluntary system, was the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles. This was one of two systems in the body; the other being the autonomic nervous system.
Kelvans could immobilize multiple targets with a neural field that selectively neutralized nerve impulses to their voluntary muscles. (TOS: "By Any Other Name")
In 2373, The Doctor informed Kes that Tom Paris' somatic systems were functioning, having successfully treated him despite the onset of memory fragmentation in his program. (VOY: "The Swarm")