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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 outer layer of the perocardium, called the parietal pericardium, consists of an outer layer of strong, thick connective tissue (called the fibrous pericardium) and an inner serous layer (the serous pericardium).