UVEAL TRACT

Clinical anatomy of uvl tract

We discussing the anatomy of iris ciliary body and choroid to makethings easier.

we will start with the anatomy of choroid and then everything will make sense so the outermost layer of the choroid is the suprachoroidal lamina this black layer that we are seeing this is the suprachoroidal lamina now there is a space between the suprachoroidal lamina and the sclera that is a suprachoroidal space whereas the posterior ciliary artery and nerves okay we'll discuss about this in another time so the first layer is suprachoroidal layer after this we have stroma the stroma mainly consists of the bulk of vessels and these vessels are arranged according to their size the largest one known as heller layer is the outermost the moderate size one known as settler layer and the innermost the choreo capillaries which are smallest in size and these choreocapillaries are important because they nourish the outer part of the retina means our retinal pigment epithelium and rods and cones means this is the part of retina which is not being supplied by the central retinal artery but by these choreocapillaries this makes it important now we have a basal lamina of our stroma that is the brooks membrane and finally we have retinal pigment epithelium which is separated by a small space between from brooks membrane so the three layers we studied are suprachoroidal layer the stroma and the brooks membrane and finally we have retinal pigment epithelium that is a part of retina okay so now let's make thing easy that this suprachoroidal lamina will continue as supraciliary lamina so the first layer of ciliary body will be supraclearly lamina and then there will be stroma and this stroma will consist of ciliaris muscle the ciliaris muscle is important for accommodation and for uv scleral outflow we have three types of fiber in the cellulose muscle these are longitudinal fiber as you may see there are oblique fibers and there are circular fibers in this room of ciliary body now the longitudinal fiber and the oblique fiber help in the outflow of the aqueous means uv scleral outflow and the circular fiber are the one which help in accommodation the third layer in the ciliary body is the pigment epithelial layer okay now this pigment epithelial layer is the continuation of retinal pigment epithelium um due to paucity of space this is a simatic diagram so just try to understand i have just drawn an arrow that retinal pigment epithelium is the one which contributes to the pigment epithelium of the chloride then we have a non-pigment epithelial layer and this non-pigment epithelial layer is the one which is derived from sensory retina means the layer which will be more inside this will derive the non-pigment epithelium okay so these were the four layers in four important layers of ciliary body the supra ciliary lamina stroma the pigment epithelium derived from retinal pigment epithelium the non-pigment epithelium derived from sensory retina going on with iris will make things more easy the supraciliary lamina continues forward forming interior limiting layer now this interior limiting layer is the one which contains fibroblast and pigment cell and this decides the color of the iris means if this layer is thickened it will result in a dark iris and if this layer is thin there will be a blue iris moreover it also depends on the amount of pigment the second layer as we see is the continuation of is the stroma and this trauma is important because it contains two important muscles sphincter pupillae and dilated papillae also nelson vessels the sphincter papillary being the cause of active meiosis is supplied by um supplied by parasympathetic innervation and are dilated people pupillae being the one which causes active meduses located in the peripheral part of the stroma is one which is responsible for uh which is supplied by a sympathetic innervation the third layer is the interior epitheli