UVEA constitutes- middle vascular coat • 3 parts- a)iris b)ciliary body c)choroid • Developmentally,structurally and functionallyindivisible • color varies from light blue to dark brown EMBRYOLOGY IRIS- • Both layers of epithelium derived from marginal region of optic cup (neuroectoderm) • Sphincter and dilator pupillae- anterior epithelium (neuroectoderm) • Stroma and vessels- vascular mesoderm