THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The pericardium, also called pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels . It has two layers, an outer layer made of strong inelastic connective tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium).

Detailed explanation-2: -The epicardium is the outermost layer of the heart. It is actually the visceral layer of the serous pericardium, which adheres to the myocardium of the heart. Histologically, it is made of mesothelial cells, the same as the parietal pericardium.