Reticular activating system
Reticular Activating System
The Reticular Activating System (RAS) (/rɪˈtɪkjʊlər æktɪveɪtɪŋ ˈsɪstəm/), also known as the extrathalamic control modulatory system, is a set of interconnected nuclei that are located throughout the brainstem.
Etymology
The term "reticular" is derived from the Latin word "reticulum" which means "little net", and "activating system" refers to the role of the system in regulating arousal and sleep-wake transitions.
Function
The RAS plays a crucial role in maintaining behavioral arousal and consciousness. It is involved in controlling the overall degree of the brain's alertness and is responsible for the sleep-wake cycle. The RAS also plays a role in modulating muscle reflexes, heart rate, and blood pressure.
Structure
The RAS consists of several major components including the raphe nuclei, the locus coeruleus, and the pedunculopontine nucleus. These components are interconnected and work together to regulate the body's state of arousal and consciousness.
Related Terms
- Arousal: A state of being awake and responsive to stimuli.
- Brainstem: The part of the brain that connects the cerebrum with the spinal cord.
- Consciousness: The state of being aware of and able to think and perceive.
- Raphe Nuclei: A cluster of nuclei found in the brainstem that releases serotonin to the rest of the brain.
- Locus Coeruleus: A nucleus in the pons involved in responses to stress and panic.
- Pedunculopontine Nucleus: A collection of neurons located in the upper pons in the brainstem.
External links
- Medical encyclopedia article on Reticular activating system
- Wikipedia's article - Reticular activating system
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