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NERVOUS SYSTEM

CONTENT

  1. Definition of Nervous System
  2. The Central Nervous System
  3. The Spinal Cord
  4. The Peripheral Nervous System
  5. Reflex Actions

 

Definition of Nervous System

This system is concerned with the ability of the animal to respond to changes in the environment.

The nervous system of mammals comprises of:

  • Central Nervous System
  • Peripheral Nervous System

The Nervous System

The Central Nervous System

The central nervous system (CN) consists of the brain and spinal cord. They help to coordinate the activities in both the internal and external environment.

The Nervous System

The brain is divided into three parts:

  1. Fore brain consist of olfactory lobe and cerebrum. The olfactory lobe is responsible for smell while the cerebrum is responsible for intelligence, memory, imagination and voluntary action.
  2. The mid brain consists of optic lobe and it is responsible for sight.
  3. The hind brain consists of cerebellum, pons varolli and medulla oblongata. The cerebellum is responsible for body equilibrium and muscular control. The pons varolli helps to receive impulse from mid brain into hind brain and back, medulla oblongata is responsible for simple reflex action like sneezing, coughing etc.

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