2.2 Human Nervous System


Human Nervous System

1. The human nervous system is divided into
(a) Central nervous system (or CNS) – consists of the brain and spinal cord.
(b) Peripheral nervous system (or PNS) – consists of the spinal nerves and cranial nerves.


Chart showing the classification of human nervous system


Human nervous system



Central Nervous System
  1. The central nervous system is the control centre of the body.
  2. This system consists of the brain and the spinal cord.
  3. The brain controls all voluntary actions of the body like walking and talking.
  4. The spinal cord controls the reflex actions such as sneezing.


Peripheral nervous system
  1. The peripheral nervous system consists of all the nerves which connect the central nervous system to the receptor and effector located at other parts of the body.
  2. The function of the peripheral nervous system is to transmit impulses from the sensory organ through central nervous system to the effector to respond accordingly.