The nervous system in humans can be divided into (1) the Central Nervous System (CNS) and (2) the Peripheral Nervous System (PNS).

The Central Nervous System (CNS) contains the brain and spinal cord.

The Peripheral Nervous System (PNS) contains everything outside, or "peripheral" to, the brain and spinal cord such as cranial nerves, spinal nerves, and the autonomic nervous system.