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| Nictitating Membrane Third Eyelid | Eyelid, Third | Eyelids, Third | Membrane, Nictitating | Membranes, Nictitating | Nictitating Membranes | Third Eyelids A fold of the mucous membrane of the CONJUNCTIVA in many animals. At rest, it is hidden in the medial canthus. It can extend to cover part or all of the cornea to help clean the CORNEA. |