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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This epithelium has 40 to 50 layers of cells. They change shape as they migrate from the basal layer to surface: cuboidal cells in the basal layers, round cells in the middle layers, and flattened (squamous) in the upper layers.
The epithelium is separated from the underlying connective tissue by a thin basement membrane. It is seen as a dark band beneath the epithelium.
Keratin is not necessary because this epithelium is not exposed to the desiccating effects of air and is constantly kept moist.