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Peripheral nervous system: Consists of nerves and ganglia outside the brain and spinal cord. The peripheral nervous system serves to interconnect all other tissues with the central nervous system. Peripheral nerves are connected to the spinal cord by two roots: the anterior, ventral, or motor root and the posterior, dorsal, or sensory root. The peripheral nervous system innervates all voluntary muscles and transmits the sensory impulses from the whole body. It is largely under conscious (cerebral) control. Injury or disease of the peripheral nerves usually results in both sensory and motor loss. Because of the regenerative ability of the neurilemma, however, eventual recovery is possible if the nerve is largely intact or the ends of the divided nerve are placed close together.

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