To be more precise, and less offensive to language purists, sections of peritoneum that suspend specific organs are individually named; for example, mesogastrium for the stomach, mesojejunum for the jejunum and mesometrium for the uterus.
An important feature of mesentery is that it serves as a conduit for blood vessels, nerves and lymphatic vessels going to and from the organ in question. The image below shows a loop of small intestine from a mouse. The glistening membrane inside the loop of bowel is mesentery; mesenteric blood vessels running through bundles of fat are clearly visible.
Omenta are abdominal structures formed from peritoneum and structurally similar to mesentery. Remember not to confuse the abdominal cavity with the intraperitoneal space, which is located within the abdominal cavity and wrapped in peritoneum tissue. For example, a kidney is inside the abdominal cavity, but is retroperitoneal—located outside the peritoneum. The peritoneum and the kidney : A sagittal section through the posterior abdominal wall, showing the kidney residing outside the peritoneum.
Although they ultimately form one continuous sheet, there are two layers of peritoneum and potential space between those layers.
The term mesentery is often used to refer to a double layer of visceral peritoneum. There are generally blood vessels, nerves, and other structures between these layers. The space between the two layers is technically outside of the peritoneal sac, and thus not in the peritoneal cavity. There are two main regions of the peritoneum, connected by the epiploic foramen also known as the omental foramen or foramen of Winslow.
The first is the greater sac or general cavity of the abdomen. The second is the lesser sac or omental bursa. The lesser sac is divided into two omenta: the gastrohepatic and the gastrocolic. The gastrohepatic omentum is attached to the lesser curvature of the stomach and the liver. The gastrocolic omentum hangs from the greater curve of the stomach and loops down in front of the intestines before curving upwards to attach to the transverse colon. Like a curtain of tissue, it is draped in front of the intestines to insulate and protect them.
Substructures of the peritoneum : This is a midsagittal, cross-section drawing of the epiploic foramen, the greater sac or general cavity red , and the lesser sac or omental bursa blue. The structures in the abdomen are classified as intraperitoneal, retroperitoneal, or infraperitoneal depending on whether they are covered with visceral peritoneum and are attached by mesenteries, such as the mensentery and mesocolon.
Intraperitoneal organs include the stomach, the first five centimeters and the fourth part of the the duodenum, the jejunum, the ileum, the cecum, the appendix, the transverse colon, the sigmoid colon, and the upper third of the rectum. How are the intestines related to the peritoneum? The classical metaphor to explain it, is to describe the peritoneal sac as a 'balloon' and to imagine the intestines being pushed into this 'balloon' of peritoneum from posteriorly. As a result, a layer of peritoneum comes to lie draped over the intestine.
Previous Next. Description: The structures in the abdomen can lie in one of three locations in relation to the peritoneum: intraperitoneal, secondary retroperitoneal or primary retroperitoneal. These locations differ in accessibility and mobility. The origin of these three locations, their adult configuration and the characteristics of organs at these places, are discussed. Anatomical structures in item: Peritoneum. Requirements for usage You are free to use this item if you follow the requirements of the license: View license.
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The structures in the abdomen can lie in one of three locations in relation to the peritoneum: intraperitoneal, secondary retroperitoneal or primary retroperitoneal.
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