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raphe nucleus

raphe nucleus in Medicine

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.

The American HeritageĀ® Stedman's Medical Dictionary
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