Epithelial Tissue

Epithelial tissue spreads throughout the body. They form the cover of all the body surfaces, the main body of the glands, the body cavity of the wire and the hollow organs. They have numerous functions including protection, secretion, absorption, excretion, filtration, diffusion and sensory acceptance.

Cells in epithelial tissue are densely packed with very few intercellular matrix. As the tissue forms a cover and lining, the cells have a free surface that is not in contact with other cells. On the other side of the free surface, the cells are attached to the underlying connective tissue via an acellular basement membrane. Membranes are secreted from the superior and connective tissue cells [Glossary]: a mixture of carbohydrates and proteins

The shape of epithelial cells can be scaly, cuboidal or cylindrical and can be arranged in a single layer or multilayers.

Simple cuboid epithelium is found in glandular tissue and renal tubules. Simple columnar epithelial cells are located in the stomach and intestines. Pseudo-stratified columnar epithelial cells line a portion of the airway and a portion of the male reproductive tract. The transitional epithelium may expand or stretch. The glandular epithelium is used in particular for the production and secretion of substances

Epithelial tissue is derived from all three major embryonic layers. Epithelial tissue constituting the skin membrane originates from the ectoderm. The epithelial tissue that constitutes the majority of the mucosa is derived from the endoderm. The epithelial tissue that aligns blood vessels with the open space in the body is derived from mesoderm. Epithelial tissue that aligns blood vessels in the lymphatic system and cardiovascular system is called the endothelium and the epithelial tissue that forms the serosa of the true inner layer is particularly noteworthy that it is called mesothelium.

The epithelial membrane consists of the epithelium attached to the connective tissue layer, for example your skin. Mucosa is also a complex of connective tissue and epithelial tissue. These epithelial membranes, sometimes called mucous membranes, line up the body cavity and the hollow passageway, including the digestive tract, the respiratory tract, the drainage duct and the reproductive tract, to the external environment. The epithelial layer is covered by mucus produced by epithelial exocrine glands. Potential connective tissue called the lamina propria (literally "its own layer") helps to support fragile epithelial layers

The membrane is a layer of connective tissue and epithelial tissue located in the external environment and the internal body cavity of the body. The synovial membrane is a connective tissue membrane that protects joints and freely moves. The epithelial membrane consists of epithelial tissue and connective tissue. These membranes were found to line up on the outer surface (skin and mucosa) or lumen (slurry). The four tissues of the body are epithelium, connective, muscular, and nerve. Epithelial tissue consists of a layer of cells covering the surface of the body that comes into contact with the outside world, forming an internal cavity and forming glands. Connective tissues combine cells and organs of the body and perform a number of functions, in particular with regard to protection, support and integration of the body.