Cells that line the inner and outer surfaces of the body by forming cellular layers (EPITHELIUM) or masses. Epithelial cells lining the SKIN; the MOUTH; the NOSE; and the ANAL CANAL derive from ectoderm; those lining the RESPIRATORY SYSTEM and the DIGESTIVE SYSTEM derive from endoderm; others (CARDIOVASCULAR SYSTEM and LYMPHATIC SYSTEM) derive from mesoderm. Epithelial cells can be classified mainly by cell shape and function into squamous, glandular and transitional epithelial cells.

Synonyms: Transitional Epithelial Cell, Adenomatous Epithelial Cell, Cell, Glandular Epithelial, Cells, Epithelial, Squamous Cells, Adenomatous Epithelial Cells, Squamous Cell, Epithelial Cells, Transitional, Epithelial Cells, Glandular, Epithelial Cell, Cell, Epithelial, Cells, Squamous Epithelial, Cells, Squamous, Cells, Glandular Epithelial, Cell, Squamous Epithelial, Glandular Epithelial Cells, Cell, Adenomatous Epithelial, Epithelial Cell, Adenomatous, Epithelial Cell, Transitional, Epithelial Cells, Adenomatous, Epithelial Cells, Squamous, Epithelial Cell, Glandular, Squamous Epithelial Cells, Cell, Transitional Epithelial, Cuboidal Glandular Epithelial Cells, Epithelial Cells, Cell, Squamous, Transitional Epithelial Cells, Cells, Transitional Epithelial, Epithelial Cell, Squamous, Columnar Glandular Epithelial Cells, Squamous Epithelial Cell, Cells, Adenomatous Epithelial, Glandular Epithelial Cell