The outer layer forming the surface of the heart is known as which?

The outer layer forming the surface of the heart is known as which?

• A. Endocardium
• B. Myocardium
• C. Epicardium
• D. Pericardial sac

Answer: (C)

The outer surface of the heart is the epicardium, which is the visceral layer of the serous pericardium. It sits directly on the myocardium and provides a smooth, lubricated surface as the heart beats within the pericardial sac. The epicardium also contains small vessels and fat that accompany the coronary arteries. The endocardium lines the inside of the chambers, the myocardium is the muscular wall, and the pericardial sac surrounds the heart but is not the heart’s surface itself.

The outer surface of the heart is the epicardium, which is the visceral layer of the serous pericardium. It sits directly on the myocardium and provides a smooth, lubricated surface as the heart beats within the pericardial sac. The epicardium also contains small vessels and fat that accompany the coronary arteries. The endocardium lines the inside of the chambers, the myocardium is the muscular wall, and the pericardial sac surrounds the heart but is not the heart’s surface itself.