Greater peritoneal cavity
Gastrosplenic ligament
Lesser sac (omental bursa)
Splenorenal ligament
(Top) The borders of the lesser sac (omental bursa) include the lesser omentum, which conveys the common bile duct and hepatic and gastric vessels. The left borders include the gastrosplenic ligament (with short gastric vessels) and the splenorenal ligament (with splenic vessels).
Ascending colon
Transverse colon
Small bowel (SB) mesentery
Descending colon
Left paracolic gutter
(Bottom) The paracolic gutters are formed by reflections of peritoneum covering the ascending and descending colon and the lateral abdominal wall. Note the innumerable potential peritoneal recesses lying between the bowel loops and their mesenteric leaves, accounting for the polygonal shape of many interloop or mesenteric fluid collections. The greater omentum covers much of the bowel like an apron.
Hepatoduodenal ligament
Epiploic foramen (of Winslow)
Greater omentum
(Top) The lesser omentum comprises the hepatoduodenal and hepatogastric ligaments and forms part of the anterior wall of the lesser sac. The greater and lesser sacs communicate through the epiploic foramen (of Winslow).
Gastrocolic ligament
Transverse colon
Greater omentum
Liver (caudate lobe)
Lesser omentum
Lesser sac
Pancreas
Superior mesenteric artery
Duodenum (3rd portion)
Transverse mesocolon
Small bowel mesentery
(Bottom) Sagittal section of the abdomen shows the peritoneal cavity artificially distended, as with air. Note the margins of the lesser sac in this plane, including caudate lobe of liver, stomach and gastrocolic ligament anteriorly, and pancreas posteriorly. The hepatogastric ligament is part of the lesser omentum and carries the hepatic artery and portal vein to the liver. The mesenteries are multilayered folds of peritoneum that enclose a layer of fat and convey blood vessels, nerves, and lymphatics to the intraperitoneal abdominal viscera. The greater omentum is a 4-layered fold of peritoneum that extends down from the stomach covering much of the colon and small intestine. The layers are generally fused together caudal to the transverse colon. The gastrocolic ligament is part of the greater omentum.
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