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The parietal layer of serous pericardium is a mesothelial layer of cells which lines the inner layer of the fibrous pericardium. Amorphous connective tissue separates the two layers.
Also, the parietal paricardium is continuous with the visceral pericardium across the points at which the great vessels traverse the pericardial cavity. The potential space between the serous and parietal pericardial layers is the pericardial cavity. Both pericardial layers secrete a small amount of fluid to lubricate this cavity.