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Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.. Other animal coverings, such as the arthropod exoskeleton, have different developmental origin, structure and chemical composition.
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. [1] The epidermis layer provides a barrier to infection from environmental pathogens [2] and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.
skin - dead superficial layer: Stratified squamous, keratinized - integumentary: sweat gland ducts: Stratified cuboidal - integumentary: mesothelium of body cavities: Simple squamous: mesothelium: reproductive - female: ovaries: Simple cuboidal: germinal epithelium (female) reproductive - female: fallopian tubes: Simple columnar, ciliated ...
In biology, tissue is an assembly of similar cells and their extracellular matrix from the same embryonic origin that together carry out a specific function. [1] [2] Tissues occupy a biological organizational level between cells and a complete organ. Accordingly, organs are formed by the functional grouping together of multiple tissues. [3]
Epithelium or epithelial tissue is a thin, continuous, protective layer of cells with little extracellular matrix. An example is the epidermis, the outermost layer of the skin. Epithelial (mesothelial) tissues line the outer surfaces of many internal organs, the corresponding inner surfaces of body cavities, and the inner surfaces of blood vessels.
Tissue of origin [citation needed] Function Group [footnote 1] Subgroup Germ layer of origin Biomarkers Brunner's gland cell crypt basal stem cells in duodenum, duodenal submucosa [citation needed] enzyme and alkaline mucus secretion Exocrine secretory epithelial cells Endoderm: Insulated goblet cell: respiratory and digestive tracts mucus ...
The reticular layer is the deep layer of the dermis and consists of the dense irregular connective tissue. These layers serve to give elasticity to the integument, allowing stretching and conferring flexibility, while also resisting distortions, wrinkling, and sagging. [3] The dermal layer provides a site for the endings of blood vessels and ...
The dermis is composed of three major types of cells: [3] fibroblasts, macrophages, and mast cells.. Apart from these cells, the dermis is also composed of matrix components such as collagen (which provides strength), elastin (which provides elasticity), and extrafibrillar matrix, an extracellular gel-like substance primarily composed of glycosaminoglycans (most notably hyaluronan ...