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Nictitating membrane   Listen
Nictitating membrane

noun
1.
A protective fold of skin in the eyes of reptiles and birds and some mammals.  Synonym: third eyelid.





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"Nictitating membrane" Quotes from Famous Books



... connection with these experiments are of general interest. The frog, when it first sees a moving object, usually draws the nictitating membrane over the eye two or three times as if to clear the surface for clearer vision. Frequently this action is the only evidence available that the animal has noticed an object. This movement of the eye-lids I have noticed in other amphibians and in reptiles under similar ...
— Harvard Psychological Studies, Volume 1 • Various
... The nictitating membrane, or third eyelid, with its accessory muscles and other structures, is especially well developed in birds, and is of much functional importance to them, as it can be rapidly drawn across the whole eye-ball. ...
— The Descent of Man and Selection in Relation to Sex • Charles Darwin


Words linked to "Nictitating membrane" :   oculus, third eyelid, protective fold, optic, eye, haw


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