Epithelium

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. Epithelial tissue is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues lack blood or lymph supply, but are supplied by nerves.

carcinoma that derives from squamous epithelial cells

thumb|alt=Alt text|A scutoid compared with a Prism (geometry)|prism, [[frustum, and prismatoid]] thumb|Two 5-6 scutoids, flipped and attached A scutoid is a particular type of geometric solid between two parallel surfaces. The boundary of each of the surfaces (and of all the other parallel surfaces between them) either is a polygon or resembles a polygon, but is not necessarily planar, and the vertices of the two end polygons are joined by either a curve or a Y-shaped connection on at least one of the edges, but not necessarily all of the edges. Scutoids present at least one vertex between the

mucosa which serves to moisten and protect the airways

Filaggrin (filament aggregating protein; FLG) is a filament-associated protein that binds to keratin fibers in epithelial cells. Ten to twelve filaggrin units are post-translationally hydrolyzed from a large profilaggrin precursor protein during terminal differentiation of epidermal cells. In humans, profilaggrin is encoded by the FLG gene, which is part of the S100 fused-type protein (SFTP) family within the epidermal differentiation complex on chromosome 1q21. In cetaceans and sirenians, the FLG family has lost its function, with the curious exception of manatees in the latter clade: manatee

tissue type

tissue type

part of the gut

tissue type

inner lining of the vagina

sheet of cells that covers the body of a eumetazoan

the internal, transverse structures that line the vagina

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