It is believed to have once been part of a nictitating membrane, which is like a third eyelid that moves across the eye to protect it or to moisten it. Photo: Toby Hudson. is called the plica semilunaris of conjunctiva.
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 the eye while also keeping visibility.
Nictitating membrane flaps are used to cover and protect a weakened cornea, but are not usually a source of tissues for the cornea. I suppose you could have a xenograft transplant. In humans the plica semilunaris is a remnant of the nictitating membrane.
Obviously we can not move it but still has some lacrimal drainage function and helps on …
You would have to take massive immunosuppressants. The only remnent of our nictitating membrane. This tiny fold of skin in the corner of the eye is a vestige of the nictitating membrane—essentially, a third eyelid from a time when we needed something like that. but this is a vistigial tissue that does not really do anything.
... Now, if you desire to look like a reptile, bird, fish, amphibian, or certain other non-human mammals, I recommend pursuing that because I think it would be very interesting to see. Nictitating membrane flaps provide more support to the diseased cornea than the temporary complete tarsorrhaphy in horses.
Other articles where Nictitating membrane is discussed: crocodile: Form and function: …upper and lower eyelids, the nictitating membrane (that is, a thin, translucent eyelid) may be drawn over the eye from the inner corner while the lids are open. 16 comments share The nictitating membrane of a chicken.. Nictitating Membrane . Nictitating membrane or third eyelid of a masked lapwing (Vanellus miles). The delicate eyeball surface is thus protected under the water, while a certain degree of vision is still possible.
Most animals have fully functioning nictitating membranes, but the plica luminaris is now a vestigial structure in some mammals, such as humans.
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