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raphe nucleus

   Also found in: Wikipedia 0.01 sec.
raphe nucleus
n.
Any of the various unpaired nerve cell groups that are located in and along the median plane of the mesencephalic and rhombencephalic tegmenta that include neurons with serotonin-carrying axons that extend to the hypothalamus, septum, hippocampus, and cingulate gyrus.


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Dopamine may still have a key role, the researchers noted, which is why they were surprised to find harmful effects of stress converging in a brain region- the dorsal raphe nucleus --where nerve cells that use serotonin, a chemical nerve signal that has been associated with wake and sleep cycles, mood, anger, status and aggression, are abundant.
The hypothalamus plays a role in the onset and maintenance of sleep while the locus ceruleus and the dorsal raphe nucleus play a role in the onset and maintenance of REM sleep.
 
 
 
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