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Pericardial Sac

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Updated October 18, 2012

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Definition: The pericardial sac, also called the pericardium, is a pouch of highly elastic tissue that surrounds and encloses the heart. The pericardial sac helps to protect the heart from infection and trauma. A small amount of fluid in the space between the heart muscle and the pericardial sac provides lubrication, and allows the heart to beat freely.
Also Known As: pericardium

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