Fig. 26-4. Median section through the abdomen to show the peritoneal cavity. The lesser sac is situated behind the stomach and in front of the pancreas. The caudate lobe invaginates the lesser sac. Below the liver, the stomach, transverse colon, and small intestine are seen in section. The greater omentum and transverse mesocolon are fused posteriorly. The arrows indicate surgical approaches to the lesser sac. The relations in the pelvis are shown also in fig. 31-9. Click for high resolution image.