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The Central Nervous system compraises the brain and the spinal cord.
and The Peripheral Nevous system comprises the nerves. ..

The 2 main parts of the nervous system is the Central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consist of the brain and the spinal cord,  while the PNS consists of nerve vessels. PNS is further subdivided into  somatic and autonomic nervous systems and autononomic is subdivided into sympathetic and parasympathetic nervous system