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The pericardium, also called pericardial sac, is a double-walled sac containing the Heart and the roots of the great vessels. It has two layers, an outer layer made of strong connective Tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium). It encloses the pericardial cavity, which contains pericardial fluid, and defines the middle mediastinum. It separates the heart from interference of other structures, protects it against infection and blunt trauma, and lubricates the heart's movements.[from Wikipedia]
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