Peri cardium

The pericardium, also called pericardial sac, 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 is a thin sac that surrounds your heart. It protects and lubricates your heart and keeps it in place within your chest. Problems can occur when the pericardium becomes inflamed or fills with fluid. The swelling can damage your heart and affect its function. The pericardium is composed of three membranous layers that encircle the exterior of the heart: the outer fibrous pericardium, the middle parietal pericardium, and the inner epicardium (also referred to as the visceral pericardium).