Reticular activating system
（重定向自Ascending Reticular Activating System）
![](/Images/godic/202412/22/Gray6904109.png")
The reticular activating system (RAS), or extrathalamic control modulatory system, is a set of connected nuclei in the brains of vertebrates that is responsible for regulating wakefulness and sleep-wake transitions. As its name implies, its most influential component is the reticular formation.