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reticular activating system

reticular activating system in Medicine

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 HeritageĀ® Stedman's Medical Dictionary
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