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Lumen

By Amber J. Tresca, About.com

Updated: December 31, 2007

About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Definition: The opening inside a tubular body structure that is surrounded by body tissue known as an epithelial membrane. Examples of structures that have a lumen include the large intestine, small intestine, veins and arteries.
Pronunciation: (lū′men, -min-ă, -menz)

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