Answer
The innermost layer of the pericardium-- the visceral layer of the serous pericardium--is a part of the pericardium but also a part of the wall of the heart.
Work Step by Step
The pericardium has three layers-- the fibrous outer pericardium, the parietal layer of the serous pericardium, and the innermost layer-- the viscouss layer of the serous pericardium. This last layer, also called the epicardium, is one of the layers of the wall of the heart and is tightly bound to its surface.
