Subdivisions:
•1. Somatic Nervous System
• Include nerve cells that innervate skeletal muscle.
•2. Autonomic Nervous System
• Nerve cells that control smooth muscle and glands which are not under voluntary control
•Enteric Nervous System
• Network of nerves in gastrointestinal tract that can function independently of the rest of the nervous system but which is under the influence of the autonomic nervous system.