The nervous system is essentially the body's communications system, a vast network of nerve cells known as neurons and other specialised cells distributed throughout the body. Information about the internal environment of the body and its surroundings is received, processed and then reacted to. It is the activity of the nervous system that creates human experience. The nervous system comprises two main elements: the central nervous system and the peripheral nervous system.
The Central and Peripheral Nervous Systems
The central nervous system comprises the brain and spinal cord. The peripheral nervous system includes the nerve fibres sent out from the cranial nerves and spinal cord to all parts of the body including the organs. Information is passed from the peripheral nervous system to the central nervous system and vice versa by means of electrical activity between the cells.
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