The distal extremity of the limb is protected by the hoof, which is formed by epithelial keratinization over a greatly modified dermis*; this is continuous with the common dermis of the skin at the coronet (the term applied to the junction between skin and hoof). The
hoof is conveniently divided into wall, periople, sole,and frog; the last is an integral part of the hoof capsule,although homologous with the digital pad of other species