Epithelial tissue - basic principle

Simple columnar epithelium Nucleus of the epithelial cell Nucleus of the epithelial cell Columnar epithelial cell Columnar epithelial cell Simple columnar epithelium

Stratified squamous epithelium Nucleus of the squamous epithelial cell Dividing cuboidal cells at the bottom Dividing cuboidal cells at the bottom Nucleus of the squamous epithelial cell Squamous epithelial cell Squamous epithelial cell Stratified squamous epithelium