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The main difference between visceral and parietal pericardium is that visceral pericardium is the innermost layer of the pericardium, whereas parietal pericardium is the outer layer. Visceral and parietal pericardium are two layers of the serous pericardium, a thin, fibrous membrane.
The thin serous pericardium is a serous membrane, or serosa. Like all serous membranes, it consists of two layers: The outer parietal layer that lays directly on the cavity wall, that is, onto the inner surface of the fibrous pericardium; The inner visceral layer that directly covers
Parietal layer of the serous pericardium: This is the outer layer that’s firmly attached to your fibrous pericardium. There’s no space between them. Visceral layer of the serous pericardium: This is the innermost layer of your pericardium.
The visceral serous pericardium extends to the root of the great vessels and joins the parietal serous pericardium at the anatomical base of the heart. This junction occurs at two areas: the ventricular outflow tracts where the aorta and pulmonary trunk leave the heart, and the inflow tracts where the superior / inferior vena cava and pulmonary ...
Parietal vs. visceral pericardium. The pericardium has, as many other serosal surfaces, a parietal and a visceral component. The parietal pericardium is composed of two layers: a serosal lining (thin red line) and a fibrous sac (thicker yellow line).
The pericardium is supplied by the pericardio-phrenic branches of the internal thoracic arteries. The visceral pericardium drains lymph into the tracheal and bronchial lymph chain. The parietal pericardium has lymphatic drainage similar to that of the sternum and diaphragm.
The most superficial layer, the fibrous pericardium, is robust and composed of many layers of connective tissue. The serous pericardium is divided into the parietal pericardium, which is directly fused with the fibrous pericardium, and the visceral pericardium, which adheres directly to the heart.
Enclosed within the fibrous pericardium, the serous pericardium is itself divided into two layers: the outer parietal layer that lines the internal surface of the fibrous pericardium and the internal visceral layer that forms the outer layer of the heart (also known as the epicardium).
The outer layer, the parietal layer, is completely adhered to the fibrous pericardium. The inner layer is known as the visceral layer, which covers and protects the great vessels and heart. The space between the parietal and visceral layers is called the pericardial cavity.
The visceral pericardium is a mesothelial cell monolayer that adheres firmly to the epicardium, reflects over the origin of the great vessels, and becomes the serosal layer of the parietal pericardium, a tough, fibrous tissue that envelops the heart.