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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).
1 The serous pericardium consists of two layers: a parietal pericardium and a visceral pericardium. 2  The parietal pericardium is fused to the internal surface of the fibrous pericardium and is so closely adherent to it that they are difficult to separate. The pericardium consists of two parts : (1) a strong external layer composed of tough fibrous tissue, called the fibrous pericardium, and (2) an internal double-layered sac composed of a transparent membrane called the serous pericardium.