Nervous System

**Nervous system** includes the brain, the nervous tissue contained within the cranium, and the spinal cord, the extension of nervous tissue within the vertebral column. The nervous system can be divided into two major regions: the central and peripheral nervous systems. The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else. The peripheral nervous system is so named because it is on the periphery – meaning beyond the brain and spinal cord. Depending on different aspects of the nervous system, the dividing line between central and peripheral is not necessarily universal.



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## Keywords
nervous system brain cerebral spinal nerve spinal cord peripheral nerves central visceral