The CNS is the main center of impulse response in the human body. The Peripheral Nervous System, PNS, is made up of all the nerves, ganglia, and neurons that transmit information from the periphery to the CNS. The PNS is divided into two: sensory and motor Peripheral Nervous Systems, both of which are in turn divided into the Somatic and Visceral Nervous Systems.
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The CNS is basically composed of the brain and the Spinal cord. The CNS does not include the neurons, ganglia, or any other organs that are involved in the transmittance of impulses, the Peripheral Nervous System does.