The system of nerve pathways within the brain that is involved in arousal.
System of nerve pathways in the brain concerned with the level of consciousness, from sleep and relaxation to full attention and concentration.
The system of nerve pathways in the brain concerned with the level of consciousness, from the states of sleep, drowsiness, and relaxation to full alertness and attention. The system integrates information from all of the senses and from the cerebrum and cerebellum and determines the overall activity of the brain and the autonomic nervous system and patterns of behavior during walking and sleeping.
The alerting system of the brain consisting of the reticular formation, subthalamus, hypothalamus, and medial thalamus. It extends from the central core of the brainstem to all parts of the cerebral cortex. This system is essential in initiating and maintaining wakefulness and introspection and in directing attention. Sedative and tranquilizing drugs may depress the RAS temporarily; some strokes may permanently injure it.