composed almost entirely of cells
form continuous sheets held together by junctions of desmosomes
avascular but innervated
contains no blood vessels but supplied by nerve fibers
rapidly replaces lost cells by cell division
part of the basement membrane. layer of gel like substance that keeps large molecules from moving up into epithelium
part of the basement membrane. connective tissue, strong part, makes basal laminae strong
holds the epithelium to underlying tissues
single layer of flattened cells with disc shaped nuclei and sparse cytoplasm. Used for diffusion and filtration, and friction reducing lining in lymphatic and cardiovascular systems. Present in lung, kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae.
single layer of cube like cells with large, spherical central nuclei. Function in secretion and absorption. Present in kidney tubules, ducts and secretory portions of small glands, and ovary surface.
single layer of tall cells with oval nuclei. Function in absorption and secretion.
simple columnar epithelial cells that line digestive tract and gallbladder.
simple columnar epithelial cells that line small bronchi, uterine tubes, and some regions of the uterus.
increase surface area for absorption. Found in the small intestine.
single layer of cells with different heights; some do not reach the free surface. Function in secretion and propulsion of mucus. Present in the trachea (ciliated) and male sperm carrying ducts (non ciliated).
thick membrane composed of several layers of cells. Function in protection of underlying areas subjected to abrasion.
quite rare in the body. Found in some sweat, mammary glands, and areas involved in the gamete production.
Stratified columnar epithelium
the most rare. the first layer is cuboidal with one layer of columnar on the surface. found in the pharynx, anal canal, and male urethra.
Transitional epithelial tissue
several cell layers, basal cells are cuboidal, surface cells are dome shaped. Stretches to permit the distention of the urinary bladder. Lines the urinary bladder, ureters, and part of the urethra.