conjunctiva(redirected from conjunctival sac)
Also found in: Dictionary, Thesaurus, Medical.
Related to conjunctival sac: tarsal plate, Tarsal glands
the connective membrane of the eye.
The conjunctiva is the transparent mucous membrane that covers the posterior surface of the lids and the anterior surface of the eyeball as far as the cornea; therefore it is distinguished, respectively, as palpebral conjunctiva or ocular (scleral) conjunctiva. The tunica conjunctiva consists of an epithelial layer and a connective-tissue base. It contains glands that perform the function of supplementary lacrimal glands. The conjunctiva is rich in blood and lymph vessels and sensory nerves.