The nervous system is divided into two main parts:

1. Central Nervous System (CNS) : The CNS consists of the brain and the spinal cord and is the site of information processing and control. 

2. Peripheral Nervous System (PNS) : It is formed the nerves. The nerves which arise from the central nervous system constitute the peripheral nervous system.

The PNS can be further divided into two parts that is :

i. Somatic neural system. 
ii. Autonomic neural system.