The keratin layer is much thicker than the cellular layer. A closer examination reveals the outlines of cells within the keratin. This reflects the cellular origins of the keratin. These cells are dead and do not have nuclei.
Because skin is exposed to air, it is keratinized to protect the surface from abrasion and is lubricated by glycolipids to protect it from dehydration.
The basement membrane is too thin to be identified in this specimen.