In anatomy, a nail is a horn-like structure at the end of an animal's finger or toe. See also claw. Parts of the nail Anatomically fingernails and toenails are made of a tough protein called keratin and have many different parts: The free edge is the part of the nail that extends past the finger, beyond the nail plate. There are no nerve endings in the nail - this is the growing part of the nail still under the skin at the nail's proximal end. eponychium or cuticle, is the fold of skin at the… (More on Toenail)