Pleura: The serous membrane (sheet of cells) covering the surface of the lungs and lining the inside walls of the chest cavity. The visceral pleura cover the surface of the lung (one of the visceral organs, or viscera) and the parietal pleura covers the inside of the chest wall.


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Your pleura is a large, thin sheet of tissue that wraps around the outside of your lungs and lines the inside of your chest cavity. Between the layers of the pleura is a very thin space. Normally it's filled with a small amount of fluid. The fluid helps the two layers of the pleura glide smoothly past each other as your lungs breathe air in and out.

NIH: National Heart, Lung, and Blood Institute

Source: MedLinePlus (NIH)2

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Pleura: The thin serous membrane enveloping the lungs (Lung) and lining the Thoracic Cavity. Pleura consist of two layers, the inner visceral pleura lying next to the pulmonary parenchyma and the outer parietal pleura. Between the two layers is the Pleural Cavity which contains a thin film of liquid.3

Anatomy Articles

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  1. Source: RDCRN (NCATS/NIH): cms/ rld/ Learn-More/ Glossary
  2. Source: MedLinePlus (NIH): pleuraldisorders.html
  3. Source: MeSH (U.S. National Library of Medicine)

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