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The pericardium (from the Greek ÏÎµÏÎ¯, around and ÎºÎ¬ÏÎ´Î¹Î¿Î½, heart) is a double-walled sac containing the heart and the roots of the great vessels. The pericardial sac has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid. The pericardium fixes the heart to the mediastinum, gives protection against infection, and provides the lubrication for the heart.
This is the area within the heart where the membranous septum, the atrioventricular valves, and the aortic valve join in fibrous continuity. The hinge of the septal leaflet of the tricuspid valve separates the membranous septum into its atrioventricular and interventricular components (see the image below).