<Li> Cuboidal epithelium has cells whose height and width are approximately the same (cube shaped). </Li> <Li> Columnar epithelium has cells taller than they are wide (column - shaped). </Li> <P> By layer, epithelium is classed as either simple epithelium, only one cell thick (unilayered) or stratified epithelium as stratified squamous epithelium, stratified cuboidal epithelium, and stratified columnar epithelium that are two or more cells thick (multi-layered), and both types of layering can be made up of any of the cell shapes . However, when taller simple columnar epithelial cells are viewed in cross section showing several nuclei appearing at different heights, they can be confused with stratified epithelia . This kind of epithelium is therefore described as pseudostratified columnar epithelium . </P> <P> Transitional epithelium has cells that can change from squamous to cuboidal, depending on the amount of tension on the epithelium . </P>

The type of epithelial tissue that is two or more cell layers thick is called