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What does NM stand for?

NM stands for nictitating membrane

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The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye for...
The nictitating membrane is located next to the eyeball, underneath its other two eyelids and it operates independently from them. When we think of eyelids, we...
A nictitating membrane is a third eyelid that is translucent or clear. It is used as an extra level of safety for the eye and allows the creature that has...
Third Eyelid Functions. The nictitating membrane is found in many species, including mammals, birds and reptiles, but is a vestige in humans, the little bump in the...