The epidermis is made of four main layers, or strata: The stratum corneum is the thick, tough outer layer. Skin is made up of three layers. It is the outermost, protoderm-derived layer of cells that covers seeds, fruits, flowers, leaves, roots, and stem parts. Under the squamous cells are round cells called basal cells. epidermis definitions - from layers, to function, and structures. the outermost and nonvascular layer of the skin, derived from the embryonic ectoderm, varying in thickness from 0.07 to 1.4 mm. Epidermis. Content: Human Skin Layers. Subcutis is the innermost layer containing loose connective tissues, fatty tissues and elastin, which acts as an intermediate link between the skin and bones. In invertebrates, the outermost layer of cells of the organism.. epidermis outer layer of skin cells Source: Noland, George B. General Biology, 11th Edition.St. epidermis [ep″ĭ-der´mis] (pl. The outermost is the epidermis. Definition - What does Epidermis mean? Medical Definition of Epidermis. Epidermis definition, the outer, nonvascular, nonsensitive layer of the skin, covering the true skin or corium. The dermis is present beneath the epidermis layer that comprises a pilosebaceous unit, fibroblasts, collagen, mast cells and capillaries. C. V. Mosby . Under the squamous cells are round cells called basal cells. This consists mainly of cells called keratinocytes, made from the tough protein keratin (also the material in hair and nails). Definition of Skin Its main purpose is protection. Definition: The epidermis is the outer layer of the three layers that make up the skin, the inner layers being the dermis and hypodermis. It is mostly made up of flat, scale-like cells called squamous cells. Epidermis could refer to: In plants, the outermost layer of cells covering the leaves and young parts of a plant is the epidermis. The epidermis is an outer protective cell layer that provides protection against infection, mechanical injury and water loss in plants. In vertebrates, epidermis is the outermost layer of the skin. See more. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Epidermis: The upper or outer layer of the two main layers of cells that make up the skin. Louis, MO. The epidermis is mostly made up of flat, scale-like cells called squamous cells. 1983. In vertebrates , epidermis is the outermost layer of the skin . Learn with flashcards, games, and more — for free. epider´mides) (Gr.) home >> biology >> definition In plants , the outermost layer of cells covering the leaves and young parts of a plant is the epidermis . Epidermal cells include several types of cells that make up the epidermis of plants. 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