The central nervous system is composed of the brain,spinal cord and nerves it controls all the vital functions necessary for living such as breathing, maintaining body temperature, thinking, feeling and heart beat.
have you ever seen a brain? Do you know that the structure of brain is very similar to the structure of brain is very similar to the structure of walnuts shown in figure no 1.2 lets discuss the human brain.
brain is enclosed in a hard bony protective structure called cranium (skull). Brain is made up of soft nerve tissues and appears like a large pinkish grey walnut. Brain has folds and depressions which give it wrinkled appearance. It is the most amazing part of our body which serves as control centre of the human body and gives orders to the control the activities of different part of the body. Brain is always working even while sleeping. Brain consists of three parts.
It is the largest part of the brain and comprises two hemisphere. Right hemisphere controls the left side of the body