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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).
Key Points. 1  The pericardium is a mesothelium tissue of the thoracic cavity which surrounds the heart. 2  The inner layer of the pericardium, the serous pericardium, is further divided into two layers, an outer parietal layer and an inner visceral layer with the pericardial cavity in between the two layers.