Fingernails are something else taken for granted. They're the small, tough things that grow from out fingers, what is there that is notable about them? Aside from the fact that they are prime for decorating, clawing at things with, and chewing at, people don't acknowledge the common fingernail much.
The nail serves a function similar to claws in other animals, except they are much softer and more fragile. They also have similarities to horns. However, their main function is not this, instead they serve more as a barrier for the nail matrix and nail bed, which contains numerous nerves and vessels for lymph and blood. The lunula, the small lighter-colored portion at the nail's base is the visible portion of the nail matrix. They are more permeable than most people believe - in fact, they are more permeable than normal skin, meaning that despite their physical toughness, many things can pass through them.
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