Medical Definition of Endothelium
Endothelium: A layer of flat cells lining the closed internal spaces of the body such as the inside of blood vessels and lymphatic vessels (that convey the lymph, a milky fluid) and the heart.
By contrast, the outside layer of cells that covers all the free, open surfaces of the body including the skin, and mucous membranes that communicate with the outside of the body is called the epithelium.
The word "endothelium" is derived from the Greek "endon," within + G. "thele," nipple.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/9/2016
Medical Dictionary Definitions A - Z
Search Medical Dictionary
Women's Health Resources
- Personalized Tips for Managing Migraine
- 5 Things That Spike Your Blood Sugar
- Complementary Treatments for Cancer