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The nervous system is anatomically and functionally split into central and peripheral divisions.
Inside the skull and vertebrae are the the
. These two structures form the central nervous system (or CNS
), which functions as the body's assessment and control center.
A network of
extends from the central nervous system to the tissues and organs. The collection of nerves forms the peripheral nervous system (or PNS).
Inside the nerves
are the axon processes of numerous nerves cells (or neurons). The wire-like axons run the length of the nerves and are grouped by connective tissue into cylindrical bundles called fascicles (L. fasciculi
electrochemical impulses (or action potentials
) in a single direction along its outer plasma (or cell
Sensory nerve cell axons conduct impulses from the peripheral organs to the CNS and motor nerve cell axons conduct impulses from the CNS to the peripheral organs.