The structure of stratified epithelium can vary depending on its type:
In keratinized stratified squamous epithelium, found in the skin, the outermost cells are filled with keratin, a tough, protective protein. Non-keratinized stratified squamous epithelium, found in moist areas like the oral cavity, lacks keratin but still provides robust protection.
Stratified cuboidal and columnar epithelia are generally less common and are usually found in specific glandular ducts, providing additional protection and sometimes aiding in secretion.
