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Definition: a composite group of fibers traveling in the anterolateral system (spinal lemniscus) and ending in the mesencephalon; includes spinotectal fibers [TA] to the deeper layers of the superior colliculus and spinoperiaqueductal fibers [TA] that terminate in the periaqueductal gray matter.
Synonym(s): fibrae spinomesencephalicaeTA
Examples: glitazone, GI cocktail, etc.
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