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.