(in animals) a layer of covering cells lying on a basement membrane that is called simple epithelium when one cell thick and compound epithelium when several cells thick, and usually covers connective tissue embryologically derived from the ECTODERM.
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The epithelium is a type of tissue that covers internal and external surfaces of your body, lines body cavities and hollow organs and is the major tissue in glands.
An epithelial tissue or epithelium (plural is epithelia) consists of cells arranged in continuous sheets, in either single or multiple layers. Even though epithelial tissue present in different parts of the body might differ in structure and function, they all have some common characteristics.
The epithelium is a layer of cells that are bound together tightly to form sheets. These continuous sheets cover different surfaces of your body that can come into contact with foreign substances.