What are the primary divisions and subdivisions of the nervous system?

Nervous System is primarily divided into Central Nervous System and Peripheral Nervous System which are again sub divided further.

The nervous system is divided into two primary divisions: the central nervous system (CNS) and the peripheral nervous system (PNS). The central nervous system consists of the brain and spinal cord, while the peripheral nervous system includes all the nerves that extend from the brain and spinal cord to the rest of the body. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system. The somatic nervous system controls voluntary movements and sensory information, while the autonomic nervous system regulates involuntary bodily functions such as heartbeat, digestion, and breathing. The autonomic nervous system is then subdivided into the sympathetic nervous system and the parasympathetic nervous system, which have opposing effects on bodily functions to maintain homeostasis.