nervous system

noun Anatomy, Zoology.
1.
the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia.
2.
a particular part of this system.
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World English Dictionary
nervous system
 
n
See neurone See also central nervous system the sensory and control apparatus of all multicellular animals above the level of sponges, consisting of a network of nerve cells

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American Heritage
Medical Dictionary

nervous system n.
The system of cells, tissues, and organs that regulates the body's responses to internal and external stimuli. In vertebrates it consists of the brain, spinal cord, nerves, ganglia, and parts of the receptor and effector organs.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nervous system  [%PREMIUM_LINK%]     (nûr'vəs)  Pronunciation Key 
The system of neurons and tissues that regulates the actions and responses of vertebrates and many invertebrates. The nervous system of vertebrates is a complex information-processing system that consists mainly of the brain, spinal cord, and peripheral and autonomic nerves. It receives chemical information from hormones in the circulating blood and can also regulate secretions of the endocrine system by the action of neurohormones. The nervous systems of invertebrates vary from a simple network of nerves to a complex nerve network under the control of a primitive brain. See also autonomic nervous system, central nervous system, peripheral nervous system.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

nervous system definition


The system in the body that controls internal functions of the body and receives, interprets, and responds to stimuli. The nervous system is made up of the brain, the spinal cord, the nerves, and the sense organs, such as the eye and ear.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
How parasites affect their hosts' nervous system is a poorly understood area of
  research.
And, as in the uterus, progesterone's regulation of cell division in the
  nervous system is complex.
Tobacco is said to produce derangement of the digestion, and of the regular,
  steady action of the nervous system.
Or he might be fussing because he had an immature nervous system.
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