The central nervous system (CNS) is the part of the nervous system that includes the brain and spinal cord. There are two types or divisions of the nervous system. The CNS and the peripheral nervous system (PNS). The PNS connects the CNS to sensory organs, other organs of the body, glands, muscles, and blood vessels. The peripheral nerves include:
- 12 cranial nerves
- Spinal nerves and roots
- Autonomic nerves (the nerves that regulate the heart muscle, glands, and the blood vessel walls.