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Fibrous Pericardium. Continuous with the central tendon of the diaphragm, the fibrous pericardium is made of tough connective tissue and is relatively non-distensible. This rigidity prevents rapid overfilling of the heart, but can have several serious clinical consequences (see cardiac tamponade).
The Pericardium. The pericardial sac is a folded fibrous connective tissue layer that encompasses the entire heart and the roots of the great vessels. It has an inner and an outer layer which are continuous and create a fascial space known as the pericardial sac.