What are the two layers of the serous pericardium?

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The serous pericardium has two layers: the parietal layer, which lines the fibrous pericardium, and the visceral layer, which covers the heart and is known as the epicardium. These two layers are separated by a small pericardial cavity filled with serous fluid that reduces friction as the heart beats. The parietal layer stays on the outer wall, while the visceral layer stays tight to the heart’s surface, forming a continuous serous membrane. Endocardium and myocardium are layers of the heart wall itself, not the serous pericardium, so they don’t describe the two layers of this structure.