The parietal layer of the serous pericardium the parietal layer of the serous pericardium normally contains blood lies between the parietal and visceral layers of the serous pericardium is a strong layer of dense connective tissue that adheres to the diaphragm inferiorly and to the roots of the great vessels superiorly adheres to the surface of the heart adheres to the inner surface of the fibrous pericardium