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Definition: axons originating from cell bodies of the posterior horn, ascending as part of the contralateral anterolateral system, and terminating in the periaqueductal gray of the mesencephalon; involved in descending pathways for pain suppression.
Synonym(s): fibrae spinoperiaqueductalesTA
See Also: spinomesencephalic fibers
Examples: glitazone, GI cocktail, etc.
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