It is comprised of two major parts, or subdivisions, the central nervous system (CNS) and the peripheral nervous system (PNS).

它由中枢神经系统（CNS）和周围神经系统（PNS）这两个主要部分或两大分支组成。

The PNS is a vast network of spinal and cranial nerves that are linked to the brain and the spinal cord.

PNS是由连接到脑和脊髓的脊神经和脑神经构成的巨大网络。

PNS consists of total 43 pairs of nerve, among which 12 originate in brain, named as cranial nerves and 31 originate from spinal cord, hence called as spinal nerves.

周围神经系统由 43 对神经组成，其中 12 对起源于脑，称为脑神经，31 对起源于脊髓，故称为脊神经。

Structurally, nervous system is classified into two types: Central Nervous System (CNS) ; and Peripheral Nervous System (PNS) ; The Central Nervous System comprises of the brain and spinal cord.

从结构上讲，神经系统分为两类：中枢神经系统和周围神经系统。中枢神经系统由大脑和脊髓组成。

Central Nervous System The CNS represents the largest part of the nervous system. It regulates organ function, higher thought, and movement of the body. Together, with the PNS, it has a fundamental role in the control of behavior.

2、中枢神经系统 ；中枢神经系统是神系统最大的部分，它调节器官功能、高级思维和身体的运动，和PNS一起在控制行为方面具有重要作用。