Which layer forms the outer surface of the heart?

Which layer forms the outer surface of the heart?

• A. Endocardium
• B. Myocardium
• C. Pericardium
• D. Epicardium

Answer: (D)

The layer that forms the outer surface of the heart is the epicardium. This thin, outermost layer covers the heart itself and is the visceral (inner) layer of the serous pericardium, sitting just inside the fibrous pericardium. In the heart wall, you have three layers: the endocardium lines the interior chambers and valves, the myocardium is the thick muscular layer that pumps, and the epicardium covers the outside. The pericardium as a whole surrounds the heart, with the serous part having a parietal layer around the fibrous sac and a visceral layer—the epicardium—directly on the heart. So the outer surface of the heart is the epicardium.

The layer that forms the outer surface of the heart is the epicardium. This thin, outermost layer covers the heart itself and is the visceral (inner) layer of the serous pericardium, sitting just inside the fibrous pericardium. In the heart wall, you have three layers: the endocardium lines the interior chambers and valves, the myocardium is the thick muscular layer that pumps, and the epicardium covers the outside. The pericardium as a whole surrounds the heart, with the serous part having a parietal layer around the fibrous sac and a visceral layer—the epicardium—directly on the heart. So the outer surface of the heart is the epicardium.