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reticular activating system

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Medical Dictionary

Main Entry: reticular activating system
Function: noun
: a part of the reticular formation that extends from the brain stem to the midbrain and thalamus with connectionsdistributed throughout the cerebral cortex and that controls the degree of activity of the central nervous system (as in maintaining sleep and wakefulness and in making transitions between the twostates)
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

reticular activating system n.
Abbr. RAS
The part of the reticular formation in the brainstem that plays a central role in bodily and behavioral alertness; its ascending connections affect the function of the cerebral cortex and its descending connections affect bodily posture and reflex mechanisms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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