Question

The given diagram is an external view of the human brain. Study the same and answer the questions that follows.

(iii) What are the structural and functional units of the brain? How are the parts of these units arranged in A and C

Answer 1

• The basic structural and functional unit of the brain is called a neuron.
• In brain, the outer portion of the cerebrum contains cell bodies of the neurons and appear grayish in colour. This is called the gray matter.
• The inner portion of the cerebrum consists of white matter which mainly contains the axons of the neurons.
• In spinal cord the arrangement of white matter and gray matter is reversed from that in the brain.
• Here, the gray matter lies on the inner side and the white matter on the outer side.