Stratified epithelia

Definition

Stratified epithelia are layers of epithelial cells stacked on top of each other. These tissues primarily serve protective functions and are commonly found in areas prone to abrasion.

5 Must Know Facts For Your Next Test

1. Stratified epithelia are classified based on the shape of the cells in the outermost layer.
2. The different types include stratified squamous, stratified cuboidal, and stratified columnar epithelia.
3. Stratified squamous epithelium can be keratinized or non-keratinized.
4. Keratinized stratified squamous epithelium is found in the skin, providing a waterproof barrier.
5. Non-keratinized stratified squamous epithelium is found in moist areas such as the mouth, esophagus, and vagina.

Review Questions

• What distinguishes stratified epithelia from simple epithelia?
• Where can you find keratinized versus non-keratinized stratified squamous epithelium?
• Why are stratified epithelia particularly suited for protective functions?

Related terms

Simple Epithelia: Single layer of epithelial cells that facilitates absorption and filtration.

Keratinization: The process where epithelial cells become filled with keratin protein filaments, die, and form tough, resistant structures like skin.

Basement Membrane: A thin layer that separates epithelial tissue from underlying connective tissue.