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reticular activating system
(redirected from Ascending reticular arousal system)

    Also found in: Wikipedia 0.03 sec.
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.
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