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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 a barrier that protects the heart from infections that occur in nearby tissues. The pericardium consists of an outer fibrous layer and an inner serous layer. The fibrous pericardium is a tough sac that is attached to the diaphragm, sternum, and costal cartilage.