The stratum corneum is the outer layer of the |epidermis|. It is composed of flat, dead cells which have lost their nuclei. It is constantly being sloughed off as |dandruff|. These cells are rubbed off as you move, wear clothes, and wash. ~Keratin~, a horny |protein| found in hair and |fingernails|, is also found in the cells of the stratum corneum and prevents evaporation. It also helps to ward off injury because of its toughness.
