Human Nervous System...10 Billion Nerve Cells!

The nervous system of humans contains approximately 10 billion nerve cells (called neurons).

Neurons are the basic building blocks of the nervous system. Neurons consist of the nerve cell body and various extensions from the cell body. These extensions, or processes, are the dendrites (branches off the cell that receive electrical impulses), the axon (the electrical wiring and conduit tube that conducts impulses), and specialized endings (terminal areas to transfer impulses to receivers on other nerves or muscles).


Last Editorial Review: 10/24/2002




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