T. Clark Brelje, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
Robert L. Sorenson, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
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A stratified epithelium consists of multiple layers of cells. Only the basal layer is in contact with the basement membrane. The epithelium is named according to the cell type on its surface.
Stratified squamous epithelium is further classified by the presence or absence of keratin, a tough protective protein, at the apical surface.
The number of cell layers in skin ranges from a few (thin skin) to many (thick skin).
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.