Question

What constitutes the central and peripheral nervous systems?

• A. Brain and spinal cord
• B. Brain and heart
• C. Spinal cord and kidney
• D. Brain and liver

Answer 1

The correct option is A Brain and spinal cord

The brain and the spinal cord constitutes the central and peripheral nervous system.

(i) The brain which is the main coordinating centre in the body is lodged in the cranium, which protects it. It is covered by membranes called as meninges, which also help to protect it. The space between the membranes and the brain is filled with a cerebrospinal fluid, which protects the brain from mechanical shock. The three regions of the brain are fore-brain, mid-brain, and hind-brain.

(ii) The spinal cord is a long cylindrical structure enclosed in a bony cage called as the vertebral column that protects it. It begins from the medulla oblongata and extends downwards. It is also surrounded by meninges. It is concerned with spinal reflex actions and conduction of nerve impulses to and from the brain.