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:: Major Organs and Divisions of the Nervous System - Expanded View ::
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Brain (CNS)
Spinal cord (CNS)
Nerves (PNS)
Nerve(PNS)
Fascicle
Axon
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Spinal Cord (CNS)
Motoraxon
Sensoryaxon
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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 brain and spinal cord. These two structures form the central nervous system (or CNS), which functions as the body's assessment and control center.

A network of nerves 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).

Each axon conducts electrochemical impulses (or action potentials) in a single direction along its outer plasma (or cell) membrane.

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.
























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