Human Nervous System...10 Billion Nerve Cells!
The nervous system of humans contains approximately 10 billion nerve
cells (called neurons).
Last Editorial Review: 10/24/2002
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).