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Found in many animals such as birds and sharks, what is a "nictitating membrane"?

Question #149965. Asked by psnz.
Last updated Oct 17 2023.
Originally posted Oct 17 2023 8:11 PM.

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BigTriviaDawg star
Answer has 2 votes
BigTriviaDawg star
7 year member
1007 replies avatar

Answer has 2 votes.
It's a transparent eyelid to help keep the eye moist while still allowing sight.
The nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye for protection and to moisten it while maintaining vision. The term comes from the Latin word nictare, meaning "to blink". It is often called a third eyelid or haw, and may be referred to in scientific terminology as the plica semilunaris, membrana nictitans, or palpebra tertia. Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball.


Third eyelid on a domestic dog
In many species, any stimulus to the eyeball (such as a puff of air) will result in reflex nictitating membrane response. This reflex is widely used as the basis for experiments on classical conditioning in rabbits.

link https://en.wikipedia.org/wiki/Nictitating_membrane

Response last updated by BigTriviaDawg on Oct 17 2023.
Oct 17 2023, 8:12 PM
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