A system in the brain using the neurotransmitter noradrenaline (norepinephrine) that is based in the mesencephalic reticular activating system and which distributes noradrenaline throughout the brain. This system has a widespread energising influence on brain activity and is closely tied to sustained attention and alerting.
See Acetylcholine (AcH), Catecholamines, Entorhinal cortex, Epinephrine (or adrenaline), Inhibitory control, Locus coeruleus (or ceruleus), Mesencephalic reticular activating system, Motoneuron, Norepinephrine (or noradrenaline), Sustained attention