spinoperiaqueductal fibers

spinoperiaqueductal fibers

[TA] 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.
See also: spinomesencephalic fibers. Synonym(s): fibrae spinoperiaqueductales [TA]