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(1) Epithelial relates to the layer of cells which form a covering over the internal and external surfaces of the body. Examples of this would be the inner lining of the lungs, digestive tract, and skin cells.

(2) There are two main types of epithelial tissue: lining and glandular. You can develop colorectal cancer in both of them. Cancer of epithelial tissue is called a carcinoma.

Epithelial Lining Tissue

This type of epithelial tissue does what it sounds like it does: lines things. What structures it lines depends on whether the lining is simple or stratified.

Simple epithelium is one layer thick and lines the respiratory tract, blood vessels, and glands in the digestive tract, including glands in the large intestine.

Stratified epithelium is several layers thick and lines the skin, mouth, and anal canal. Squamous cell carcinoma is an example of a cancer that develops from lining epithelium.

Epithelial Glandular Tissue

Glandular epithelium forms glands. Glands secrete things and are classified as endocrine or exocrine. Endocrine glands secrete things into the bloodstream, like hormones. Exocrine glands secrete things that go outside of the body, like mucus and sweat. Cancer of a gland is called adenocarcinoma.

glossary/epithelial_tissue.txt · Last modified: 2012/10/16 14:40 (external edit)