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nervous system
The sum total of the tissues that record and distribute information, by electrical and chemical means, within the body of a higher organism.
The nervous system has two distinct parts – the central nervous system (CNS) and the peripheral nervous system. The central part is made up of the brain and spinal cord. The peripheral nervous system is so-called because it is outside the CNS. The function of the peripheral nervous system is to transmit information back and forth between the CNS and the rest of the body.
The human nervous system contains approximately 10 billion nerve cells, or neurons.
Related entries
• autonmoic nervous system
• vertebrate nervous system
• reflex arc
Related category
• ANATOMY AND PHYSIOLOGY
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