what the layers called for pericardium
The pericardium (from the Greek ÏÎµÏÎ¯, around and ÎºÎ¬ÏÎ´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.he serous pericardium, in turn, is divided into two layers, the parietal pericardium, which is fused to and inseparable from the fibrous pericardium, and the visceral pericardium, which is part of the epicardium. Both of these layers function in lubricating the heart to prevent friction during heart activity.