tractus solitarius
noun
tractus sol·i·ta·ri·us
-ˌsäl-i-ˈtar-ē-əs
: a descending tract of nerve fibers that is situated near the dorsal surface of the medulla oblongata, mediates especially the sense of taste, and includes fibers from the facial, glossopharyngeal, and vagus nerves
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Merriam-Webster unabridged
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