Tags: Anatomical Structure.
A nail is a horn-like envelope covering the dorsal aspect of the terminal phalanges of fingers and toes in humans most non-human primates and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protective protein called keratin. This protein is also found in the hooves and horns of different animals. The mammalian nail claw and hoof are all examples of unguis [plural ungues].
