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| Term |
Definition |
| Ulcer |
Erosion of either mucous membrane or skin resulting in its concavity and depression below the level of surrounding tissue. |
| Ulcerative Colitis |
A form of inflammatory bowel disease characterized by, amongst other things, chronic inflammation of the colon and ulcerations of its lining. |
| Uveitis |
Inflammation of the uvea. Collectively, the uvea refers to the iris, the choroid, and the ciliary body. The iris is the colored portion of the eye that immediately surrounds the pupil. The choroid is the thin middle layer of the eye between the sclera (the white of the eye) and the retina (the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain). Many blood vessels run through the choroid. The ciliary body is tissue that connects the iris with the choroid and includes muscles that act on the lens to change its shape. |
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