haha do you take anatomy?

nail bed im thinking

Nail technicians use science in many ways. They need to learn the anatomy of the fingers, toes, and muscles of the legs and arms. They also need to understand different bacteria's and infections control.

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Well, the part of the nail that we actually see is called the nail plate, and the skin is the cuticle. Beneath it is the nail bed and the matrix, and beneath those is the skin called the hyponychium. I don't know which three structures you actually need; I'm sure you could Google images 'the anatomy of a nail' and get a good diagram that could explain it better.

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 protein called keratin, as are animals' hooves and horns. The mammalian nail, claw, and hoof are all examples of unguis [plural ungues].

Human anatomy

The nail consists of the nail plate, the nail matrix and the nail bed below

it, and the grooves surrounding it.