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Epidermis (anatomy) - Definition


Definition

From an anatomical standpoint, the epidermis refers to the external and superficial layer of the skin. It covers the dermis and the hypodermis, the deeper tissues of the skin. At its surface, the epidermis is principally composed of dead cells, or squames, which are continually renewed. Four other cellular layers constitute the epidermis, of which the total thickness does not exceed 1 millimeter. Its surface is covered by a protectant film, called sebum.

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