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