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Nictitating membrane

nictitating membrane

A transparent fold of skin lying deep to the other eyelids at the mesial side, which may be drawn over the front of the eyeball. It is the so-called third eyelid, found in reptiles and birds generally and in many mammals.

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previous use of vestigial organs

... organs of humans before they became useless? like the appendix, the nictitating membrane ....... because they are still quite useful in other organisms like the appendix is ...

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by vinaya
Sat Oct 29, 2005 3:23 am
Forum: Genetics
Topic: previous use of vestigial organs
Replies: 7
Views: 3700

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