Chapter 2: Epithelium

Keywords

Please familiarize yourself with these keywords before you start reading the chapter:

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Apical
The surface of a cell that faces a lumen or an outside area.
Basolateral
The surfaces of a cell that faces away from a lumen or outside area.
Cilia
A organelle and cell modification that manifests as a membrane projection capable of movement.
Cornification
A layer of dead cells filled with keratin that form a protective barrier over a layer of cells. Seen with stratified squamous epithelium.
Desmosomes
A cell modification that is responsible a cell to cell adhesion resistant to shearing forces to the epithelial layer.
Endothelium
A type of simple squamous epithelium that lines in inside of vascular structures.
Epithelium
A basic tissue type that typically lines a surface (cavity, lumen or outside surface) or forms glands.  plural, epithelia; adjective, epithelial
Hemidesmosomes
A cell modification that is responsible for the adhesion of a cell to extracellular matrix.
Keratin
A structural protein and intermediate filament that provides a tough protective quality to some epithelial cell types. Seen with cornified or keratinized epithelium.
Microvilli
A cell modification that manifests as a membrane projection and increases the surface area of a cell.
Pseudostratified
A type of columnar epithelium in which the nuclei are arranged in different levels in the cell layer.
Simple
An unilayered arrangement of epithelial cells.
Stratified
A multilayered arrangement of epithelial cells.
Tight junctions
A cell modification that is responsible for cell to cell adhesion.
Urothelium 
A unique type of stratified epithelium capable of stretching that lines a majority of the urinary tract.

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Keywords by Ryan Jennings and Christopher Premanandan is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.

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