INFLAMMATION OF THE UVEAL TRACT, CONSIDERED IN ITS ANATOMIC RELATIONS.

The choroid, ciliary body and iris, taken together, form the middle tunic of the eye, and is called the uvea or uveal tract. This may be considered embryologically and histologically, as forming a continuous membrane. If we remove the conjunctiva, sclera and cornea from the globe of the eye, and evacuate its contents—the aqueous humor, lens, lens capsule, vitreous humor, and detach the retina from the choroid— we shall have left, depending upon the optic nerve, the uvea. It gets its name from its fancied resemblance to a grape hanging upon a vine (uva). The microscopic anatomy presents a striking similarity throughout its entire structure. There are, however, some variations, which may be noticed before considering the inflammation in its respsctive portions. Beginning with the choroidin situ, we find that it comprises the posterior section of the uvea, extending from the aperture of the optic nerve to the ora