3.Covering epithelium According to the number of layer and shape of cells Simple epi :---simple squamous epi ---simple cuboidal epi -m-simple columnar epi -pseudostratified ciliated columnar epi. Stratified epi ; ---stratified squamous epi -stratified columnar epl transitional epi3.Covering epithelium: According to the number of layer and shape of cells Simple epi.: ---simple squamous epi. ---simple cuboidal epi. ---simple columnar epi. ---pseudostratified ciliated columnar epi. Stratified epi.: ---stratified squamous epi. ---stratified columnar epi. ---transitional epi