Definition of Pericardium and Function

Heart Wall - Pericardium

A tough, two-layer membranous sac that encloses the heart. Is vulnerable to inflammation and infection (pericarditis).

The pericardium’s fibrous outer layer, called the fibrous pericardium, protects the heart from contact with the chest wall and other structures in the chest, including the lungs and the sternum.

The pericardium wraps completely around the heart, extending around the bases of the great vessels (aorta, superior and inferior vena cava, pulmonary artery, pulmonary vein) as they arise from the heart.

Two ligaments attach the top of the pericardium to the back of the sternum. Other ligaments loosely connect the bottom to the diaphragm. These structures anchor the heart in its place in the chest.

The inner layer is a filmy envelope. Its two surfaces are the parietal pericardium, which contacts the fibrous pericardium, and the epicardium, which covers the myocardium somewhat like a wet tissue. Inside the envelope is a watery fluid that lubricates the heart. The inner pericardium forms a nearly frictionless containment field for the beating heart.

See also ENDOCARDIUMLIGAMENT.

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