A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS. How much is x?
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The structure P is the spinal cord. It is a cylindrical structure that begins in continuation with the medulla and extends downwards.
(i) The bony cage Q is the vertebral column. The spinal cord is enclosed by the vertebral column.
(ii) R represents the meninges. The spinal cord is surrounded by membranes called the meninges.
x represent the number of pairs of spinal nerves. They are 31 in number.
S is the brain. The central nervous system consists of the brain and the spinal cord.
The reflex actions involving the spinal cord (P) are known as spinal reflexes.
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