The RAS is part of the brainstem and plays a role in cortical arousal.

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The RAS (Reticular Activating System) is a part of the brainstem and plays a crucial role in regulating consciousness and cortical arousal. It is involved in filtering sensory information and determining which signals should be prioritized for further processing by the brain. Therefore, it is responsible for maintaining an optimal state of alertness and wakefulness, and is essential for normal cognitive functioning.

The RAS Is Part of the Brainstem and Plays a Role