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==Introduction==
 
==Introduction==
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Includes development and overview of the system
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The surface of the inner wall of all of the body cavities are lined by a serous membrane which consists of a single layer of flat epithelium with a thin underlying propria (connective tissue). Within the thoracic cavity, this is known as the ''Pleura''.
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==Structure==
 
==Structure==
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*Each lung is placed within a separatte layer of membrane, thus there are two pleural sacs.
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*The space between the two sacs is known as the [[Mediastinum - Anatomy & Physiology|Mediastinum]].
 
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==Function==
 
==Function==
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