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The nervous system is comprised of two major parts, or subdivisions, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord. The brain is the body's control center.
Autonomic Nervous System. The nervous system is mainly divided into central nervous system, peripheral nervous system and autonomic nervous system. But some scientists have classified them into two divisions in which the ANS is included under peripheral nervous system category. Central nervous system consists of brain and spinal cord.