Any of a series of secretive layers of cells found in the uterus, parts of the anus and eye, the male urethra and vas deferens and in parts of the pharynx.

a type of epithelium that, though comprising only a single layer of cells, has its cell nuclei positioned in a manner suggestive of stratified columnar epithelium.

a single layer of columnar epithelial cells which are tall and slender with oval-shaped nuclei located in the basal region, attached to the basement membrane.