What does mean Pericardium?

The pericardium is a double-walled sac that encases the heart, providing protection and support. It consists of an outer fibrous layer and an inner serous layer, which further divides into parietal and visceral layers. This structure helps reduce friction between the heart and surrounding tissues during the heartbeat and contains pericardial fluid to facilitate smooth movement. Additionally, the pericardium plays a role in maintaining the heart's position within the chest cavity.