👉 The term "mesocardium" refers to a group of cardiac valves that connect the left and right coronary arteries. These valves are responsible for preventing blood from entering the heart during a heartbeat, which helps to maintain the heart's ability to pump blood throughout the body. The mesocardium is located in the left atrium, right ventricle, and pulmonary artery, and it plays an important role in regulating blood pressure and maintaining the heart's rhythmic beating.