The epidermis is made of four main layers, or strata: The stratum corneum is the thick, tough outer layer. The dermis is present beneath the epidermis layer that comprises a pilosebaceous unit, fibroblasts, collagen, mast cells and capillaries. C. V. Mosby . It is mostly made up of flat, scale-like cells called squamous cells. In vertebrates, epidermis is the outermost layer of the skin. Louis, MO. Learn with flashcards, games, and more — for free. epidermis definitions - from layers, to function, and structures. In invertebrates, the outermost layer of cells of the organism.. epidermis outer layer of skin cells Source: Noland, George B. 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 the outermost layer of our skin. Skin is made up of three layers. The outermost is the epidermis. 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. Although they serve a number of important functions, their primary role is to protect from a variety of harmful factors (environmental stressors) including microbes, chemical compounds as well as … 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. Its main purpose is protection. Epidermal cells include several types of cells that make up the epidermis of plants. Definition of Skin Definition - What does Epidermis mean? General Biology, 11th Edition.St. epider´mides) (Gr.) 1983. This consists mainly of cells called keratinocytes, made from the tough protein keratin (also the material in hair and nails). Subcutis is the innermost layer containing loose connective tissues, fatty tissues and elastin, which acts as an intermediate link between the skin and bones. the outermost and nonvascular layer of the skin, derived from the embryonic ectoderm, varying in thickness from 0.07 to 1.4 mm. In vertebrates , epidermis is the outermost layer of the skin . See more. Epidermis definition, the outer, nonvascular, nonsensitive layer of the skin, covering the true skin or corium. Epidermis. home >> biology >> definition In plants , the outermost layer of cells covering the leaves and young parts of a plant is the epidermis . epidermis [ep″ĭ-der´mis] (pl. Definition: The epidermis is the outer layer of the three layers that make up the skin, the inner layers being the dermis and hypodermis. The epidermis is mostly made up of flat, scale-like cells called squamous cells. Medical Definition of Epidermis. Content: Human Skin Layers. 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