The walls of the abdominal cavity are lined by a thin seris membrane called the peritonium. This membrane is divided into two layers, the parietal peritonium, which lines the abdominal walls and the visceral peritonium, which covers the organs. The two layers of peritonium are separated by a thin film of seris fluid for lubrication that allows organs to move against each other without friction. The peritonium forms a cavity that encloses the following organs of the abdomen, liver, except for the bare area, gallbladder, spleen, stomach, ovaries, and majority of intestines. In males, the peritonal cavity is a closed cavity. But in females, it communicates with the exterior through the uterine tubes, uterus, and vagina. The peritonal cavity includes the greater sac and lesser sac, omentopursi. The greater sac is located between the inner surface of the anterior abdominal wall and the outer surface of the abdominal viscera. It is bounded by the parietal and visceral peritonium, and it communicates with the lesser sac through the epipleoid foramen of winslow. The lesser sac is located primarily between the posterior surface of the stomach and the posterior abdominal wall. The lower sac is located between the posterior and the lower sac. Numerous folds of peritonium extend between organs, serving to hold them in position and at the same time enclose the vessels and nerves, preceding to each structure. These folds, or double layers of peritonium, are termed messentery, omentop, and paritonal ligaments. The messentery is a double layer of peritonium that encloses the intestine and attaches it to the abdominal wall. The messentery serves as a route for blood vessels, lymphatics, and nerves to reach the small intestine. An omentop is a messentery or double layer of peritonium that is attached to the stomach. The normal omentop is usually imperceptible on routine scans, visible only when fluid is present. The greater omentop is a fat-laden fold of peritonium that drapes down from the greater curvature of the stomach, and connects the stomach with the spleen and transfers colon. Whereas the lesser omentop attaches the duodenum and lesser curvature of the stomach to the liver. Numerous peritonal ligaments serve to connect an organ with another organ or abdominal wall. These peritonal ligaments are not ligaments in the classic sense, but are distinct regions of messentery connecting the structures for which they are named. Three regions of the greater omentum that are characterized as peritonal ligaments are the gastrocholic, gastrosplenic, and gastrofrenic. These ligaments attach the greater omentum to the transverse colon, hillum of the spleen, greater curvature and fundus of the stomach, diaphragm, and esophagus. Ligaments of the lesser omentum include the hepatogastric and hepatodinol, which serve to connect the stomach and duodenum to the liver. Ligaments associated specifically with the liver are the round ligament ligamentum tiers. Phosphorum ligament and coronary ligaments. The round ligament is a remnant of the left umbilical vein of the fetus and runs within the free inferior margin of the phosphorum ligament to the umbilicus. The phosphorum ligament extends from the liver to the anterior abdominal wall and diaphragm, forming a plane that divides the liver anatomically into right and left lobes. The phosphorum ligament provides the structural support that attaches the upper surfaces of the liver to the diaphragm and upper abdominal wall. The coronary ligaments surround the superior pull of the liver and attach the liver to the diaphragm, forming the margins of the bare area. The phosphorum ligament is a very important part of the liver. The phosphorum ligament is a very important part of the liver. The phosphorum ligament is a very important part of the liver. The phosphorum ligament is a very important part of the liver. The phosphorum ligament is a very important part of the liver.