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| | Chapter 3: The nervous system |
 | | The nervous system comprises the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings. |
 | | The central nervous system is composed of millions of nerve and glial cells, together with blood vessels and a little connective tissue. |
 | | By its role in central integrating mechanisms, the autonomic system is involved in behavioral and neuroendocrinological mechanisms, and in the processes whereby the body keeps its internal environment constant, that is, maintains temperature, fluid balance, and ionic composition of the blood. |
| www.dartmouth.edu /~humananatomy/part_1/chapter_3.html (3304 words) |
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