Epithelium is one of the four basic tissue types (the other three are muscle tissue, nerve tissue, and connective tissue). It is found throughout the body—covering it; lining organs, vessels, and cavities; and forming glands. It absorbs nutrients, transports electrolytes, secretes hormones, and regulates body temperature by producing sweat.

We begin with some general principles of how epithelial tissue is organized, and then we describe its various components.

After listening to this AudioBrick, you should be able to:

List the two types of epithelium (covering/lining and glandular) and describe their functions.
Describe the structure and histologic features of epithelial tissue.
Explain how covering/lining epithelium is classified.
Describe the histologic features of glandular epithelium.
Describe the five types of epithelial intercellular junctions.

You can also check out the original brick on the Histology of Epithelial Tissue from our Musculoskeletal, Skin, and Connective Tissue collection, which is available for free.

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