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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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.