Retroperitoneal structures 2
| Retroperitoneal | Intraperitoneal |
|---|---|
| Duodenum (2nd, 3rd, 4th parts) Ascending colon Descending colon Pancreas Kidneys Ureters Aorta Inferior vena cava | Stomach Duodenum (1st part) Jejunum Ileum Transverse colon Sigmoid colon |
 | |
Note the posterior aspect of this diagram (the vertebral column has been removed) showing the retroperitoneal structures, including the ascending/descending colon, kidneys, ureters and great vessels. The duodenum (2nd, 3rd, 4th parts) and pancreas are not well demonstrated here.