The pericardium is composed of three layers. The outer layer is the parietal pericardium. The middle layer is the visceral pericardium. The innermost layer is called the fibrous pericardium or epicardium.

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The pericardium is composed of two main layers: the fibrous pericardium (the outer layer) and the serous pericardium, which is further divided into the parietal and visceral layers. The visceral layer of the serous pericardium is also known as the epicardium when it is considered a layer of the heart wall.

The Pericardium Is Composed of Three Layers