Topic summary
Ascending reticular activating system
Extracted from the Wikipedia article Reticular formation.
Ascending reticular activating system
The ascending reticular activating system (ARAS), also known as the extrathalamic control modulatory system or simply the reticular activating system (RAS), is a set of connected nuclei in the brains of vertebrates that is responsible for regulating wakefulness and sleep-wake transitions. The ARAS is in the midbrain reticular formation. It is mostly composed of various nuclei in the thalamus/hypothalamus and a number of dopaminergic, noradrenergic, serotonergic, histaminergic, cholinergic, and glutamatergic brain nuclei.