what is plica semilunaris?

Question

human eye

Answer 1

It is a vestigial (persisting through evolution but doesnt perform any function or of no use) structure found in inner core of human eyes.....

Answer 2

Plica Semilunaris

Answer 3

I presume you see it as a vestigial organ. Whereas i believe in evolution, i don't think there are vestigial organs because it would be too big an investment of energy for an organism to maintain something it doesn't use. Even very slight differences lead to big discrepancies in fitness over long periods. For instance, creodonts are thought to have lost out to carnivores because they were plantigrade and carnivores digitigrade. This made a very slight difference to their efficiency which nevertheless ultimately led to their extinction, or so the theory goes. Anyway, the plica semilunaris has a function. It protects the eye from foreign bodies during sleep. It would make quite a big difference to most mammals if they lost their eyesight, so it isn't even a particularly minor function. Creationists generally don't believe in vestigial organs, so they would probably argue it was well-designed.

Answer 4

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RE:
what is plica semilunaris?
human eye

Answer 5

The plica semilunaris is an accessory organ of the eye. It is the crescent shaped fold located in the medial angle lateral to the lacrimal caruncle. For most mammals, it is a vestigal organ (such as the third eyelid in birds). Once thought to be related to the nictitating membrane; it turned out to be structurally and functionally different. For humans, it even serves an important purpose. It makes eye boogers! The process is very similar to that of the mucus membrane in the nostrils. A fatty substance is secreted, which saps up foreign materials such as dirt and dust, which could scratch the cornea. The congealed mass is then deposited into the corner of the eye, waiting be brushed away in the morning.

Answer 6

The plica semilunaris conjunctivae is the semilunar fold formed by the palpebral conjunctiva at the inner angle of the eye.

Answer 7

The plica semilunaris is small fold of tissue on the inside corner of the eye. It is the vestigial remnant of the nictitating membrane (the "third eyelid") which is present in other animals.

Answer 8

its d nictitating membrane present at d anterior angle of our eye
Its vestigial in us[aquatic animals have nictitating memb for eye protection frm water]

Answer 9

That is the little pink curved area where the white of the eye joins the pink area in the inner corner (caruncle).

Answer 10

VESTIGEAL STRUCTURE RELATED TO THE MEDIAL END OF EYES OF HUMAN