Which serous membrane forms the heart's outer surface?

Which serous membrane forms the heart's outer surface?

• A. Epicardium
• B. Visceral Pericardium
• C. Parietal Pericardium
• D. Serous Fluid

Answer: (A)

The outer surface of the heart is formed by the epicardium, which is the visceral layer of the serous pericardium. The serous pericardium has two layers: a parietal layer that lines the fibrous pericardium and a visceral layer that hugs the heart itself. The epicardium is the surface you see covering the heart, and it’s continuous with the inner lining of the heart’s vessels. Between the visceral (epicardial) layer and the parietal layer lies the pericardial cavity, filled with serous fluid to reduce friction as the heart beats. The parietal pericardium does not form the heart’s surface; it lines the outer sac. Serous fluid isn’t a membrane, so it isn’t what forms the surface either.

The outer surface of the heart is formed by the epicardium, which is the visceral layer of the serous pericardium. The serous pericardium has two layers: a parietal layer that lines the fibrous pericardium and a visceral layer that hugs the heart itself. The epicardium is the surface you see covering the heart, and it’s continuous with the inner lining of the heart’s vessels. Between the visceral (epicardial) layer and the parietal layer lies the pericardial cavity, filled with serous fluid to reduce friction as the heart beats. The parietal pericardium does not form the heart’s surface; it lines the outer sac. Serous fluid isn’t a membrane, so it isn’t what forms the surface either.