solitary tract

Medical Dictionary

solitary tract n.
A slender compact bundle of primary sensory fibers that accompany the vagus, glossopharyngeal, and facial nerves and convey information from stretch receptors and chemoreceptors in the walls of the cardiovascular, respiratory, and intestinal tracts and impulses generated by the receptor cells of the taste buds in the tongue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Solitary tract is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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