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Dictionary of Cancer Terms

View in Spanish: Tracto uveal

Uveal tract (YOO-vee-ul trakt)
The middle layer of the wall of the eye. The uveal tract has 3 main parts: (1) the choroid (the tissue layer filled with blood vessels); (2) the ciliary body (the ring of muscle tissue that changes the size of the pupil and the shape of the lens); and (3) the iris (the colored part of the eye). Also called uvea.

Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.