Epithelium
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The superficial layer of cells lining the alimentary canal andall its appendages, all glands and their ducts, blood vessels andlymphatics, serous cavities, etc. It often includes the epidermis (i.e., keratin-producing epithelial cells), and it is sometimesrestricted to the alimentary canal, the glands and their appendages,-- the term endothelium being applied to the lining membrane of theblood vessels, lymphatics, and serous cavities.
Epithelium meaning & definition 1 of Epithelium.
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The thin tissue forming the outer layer of a bodys surface and lining the alimentary canal and other hollow structures.
Epithelium meaning & definition 2 of Epithelium.