Nictitating Membrane


Eyelid, Third

Eyelids, Third

Membrane, Nictitating

Membranes, Nictitating

Nictitating Membranes

Third Eyelid

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.