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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).
* Additional info if you are interested. The outer layer of the pericardium surrounds the roots of the heart's major blood vessels and is attached by ligaments to the spinal column, diaphragm, and other parts of the body. The inner layer of the pericardium is attached to the heart muscle.A coating of fluid separates the two layers of membrane, letting the heart move as it beats, yet still be attached to the body. Source(s): http://www.texasheartinstitute.org/HIC/Anatomy/anatomy2.cfm.ihm p Â· 8 years ago.he membrane the directly covers the heart is called the visceral pericardium....but there is also a membrane around this membrane, forming a cavity, that is called the parietal pericardium.