Greater omentum

The greater omentum ( " large network " ) one from the peritoneum ( the peritoneum ) coated in fat and rich in connective tissue structure of the greater curvature of the stomach and the transverse part of the colon ( transverse colon ) in humans and other mammals hanging apron -like and the usually small bowel loops completely covered. When one speaks of the slaughtered cattle fat network.

The greater omentum is responsible for the immune response in the abdomen. It includes a large number of macrophages and lymphocytes, which in the case of an inflammatory lie propagated to the affected area and protect it from peritonitis. It also plays a role both in the context of fat storage, and in terms of regulation of fluid balance in the peritoneal cavity.

History of development

Developmentally, the omentum arises majus from a part of the back-side Magengekröses ( mesogastrium dorsal): Due to the 90 ° rotation of the stomach around the longitudinal axis - the posterior wall of the stomach that grows faster in this rotation will then be shifted as a greater curvature to the left - is the dorsal mesentery also initially pulled to the left, so it must grow. Since this part of the dorsal mesentery increases more than would be necessary for the mere rotary motion of the stomach, results in a duplication or in relation to the peritoneal lining, a four-leaf structure with inner peritoneum sheets merge soon. With the rotation of the stomach around a sagittal axis ( its transverse displacement) takes the omentum majus its a location above the transverse colon ( transverse colon ) and is now hanging down to the level of the navel. The Serosaüberzüge of the greater omentum and transverse colon melt together at their contact surfaces.

Omental bursa

In humans occur in the third month of embryonic columns in the dorsal mesentery, the merge. They form the recess pneumato - entericus dexter (there also arises a left, but quickly regresses which ) which first chest and abdominal cavity connects. This passage is closed at the top by the resulting diaphragm. With rotation about the longitudinal axis of the stomach and the associated movement of the dorsal mesentery formed therefrom on the right side thereof, the lesser sac as an open to the right bag is ultimately to lie behind the stomach. It serves as a sliding layer for this and guarantees the undisturbed movement with. After completion of the physical development, it is the largest peritoneal niche of the abdominal cavity.

To the rear it is limited parietal peritoneum that covers the pancreas, which is omentale with the tuber in the Bursa vorbuckelt, as well as the parietal peritoneum of the posterior abdominal wall to the front of the lesser omentum, stomach and ligament gastrocolicum, the connecting piece between the stomach and transverse colon that has arisen from the front portion of the dorsal mesogastrium. Outgrowths ( recess ) caused upward inferior between the stomach and transverse colon as superior recess, which runs between the lower vena cava and esophagus below the liver and down as recess. In newborns, this is often between the two still unfused leaves of the greater omentum away. The peritoneal cavity is connected via the vestibule bursae ( the forecourt of the bag ) and the epiploic foramen ( foramen Winslowi ).

The omental bursa thus has great relevance for the abdominal surgery, since only they have access to the pancreas and the adjacent areas can be achieved. Only natural access route is the epiploic foramen. Surgically may ventral paths over the lesser omentum and the gastrocolic ligament, caudal to be created through the mesentery of the transverse colon.

Pork caul

The greater omentum of pork, in the kitchen grease language network or also called briefly network, is used in the kitchen for wrapping various meats, for example, the Swiss Adrio or generally for the roast or meatloaf.