Epithelium - Definition

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Epithelium refers to a fundamental (or epithelial) tissue of which the cells are closely juxtaposed and joined together. This tissue can be an external layer, on the surface of the epidermis, as well as internal, on the mucus membranes or organs. Epitheliums are not vascular and receive their nutritional supply via the underlying conjunctival tissue and what is called a basal lamina. Each epithelial cell rests on a basal lamina, constituted of proteins and regulating nutrients.