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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 is the double walled sac that contains the heart and the roots of the great vessels that leave from or enter the heart. There are two layers of the pericardial sac: Fibrous Pericardium: The fibrous pericardium is a strong layer which covers the heart. It is made up mostly of connective tissue. Its job is to protect the heart from overstretching and also anchor it in place. This layer is the most superficial layer of the pericardium.