Answer:
perciardial
Step-by-step explanation:
The pericardium is a fibroserose sac that completely envelops the heart, in the form of a bag or sac, of great consistency, with a series of extensions that cover the root of the great vessels. It consists of two layers, a visceral (also called an epicardium) tightly attached to the surface of the heart, and a parietal separated from the anterior by a narrow capillary space that contains the pericardial fluid. The visceral pericardium is formed by a layer of mesothelial cells, adhered to the epicardial fat and epicardium and, on the other hand, in contact with the pericardial fluid. The parietal pericardium is a more fibrous layer, formed internally by mesothelial cells in continuity with those of the epicardium, but it also has another fibrous outer layer formed by layers of collagenous fibrils arranged in different directions within a connective tissue matrix that also contains elastin fibrils
The pericardial sac on the parietal part is connected by fibrous connections to the central tendon of the diaphragm and, inferior to the diaphragm by the phrenic-pericardial ligament. It is also linked by superior and inferior ligaments to the sternum (sternopericardial ligaments). On the back, the pericardium is in intimate relationship with the esophagus and descending aorta. Laterally it is related to the pleura, phrenic nerves and vessels. In its anterior part, the parietal pericardium is in intimate contact with the left half of the lower part of the sternum and, sometimes, with the fourth and fifth left sterile cartilages. On its back, the parietal pericardium maintains fibrous connections with the spine .