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TOPIC: NERVOUS SYSTEM
DEFINITION
This system is concerned with the ability of the animal to respond to changes in the environment.
The nervous system of mammals comprises:-
- Central Nervous System
- Peripheral Nervous System
Sub Topic 1
THE CENTRAL NERVOUS SYSTEM
The central nervous system (CN) consists of the brain and spinal cord. They help to coordinate the activities in both internal and external environments.
Diagram of the brain
The brain is divided into three parts:-
- 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.
- The mid brain consists of optic lobe and it is responsible for sight.
- The hind brain consists of cerebellum, pons varolli and medulla oblongata. Cerebellum is responsible for body equilibrium and muscular control. 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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