ANATOMY

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 connective tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium).

Detailed explanation-2: -The Pericardium. The pericardium is the fibrous sac that surrounds the heart.

Detailed explanation-3: -The serous pericardium is a layer of serosa that lines the fibrous pericardium (parietal layer), which is reflected around the roots of the great vessels to cover the entire surface of the heart (visceral layer).

Detailed explanation-4: -A fibrous sac called the pericardium surrounds the heart. This sac has two thin layers with fluid between them. This fluid reduces friction as the two layers rub against each other when the heart beats. Normally, this sac is thin and flexible, but repeated inflammation can cause it to become stiff and thick.