| Term | Definition |
| secondary retro-peritoneal | ascending colon... |
| secondary retro-peritoneal | descending colon |
| secondary retro-peritoneal | duodenum (except superior portion) |
| secondary retro-peritoneal | pancreas, except tail |
| retroperitoneal (primary) | esophagus |
| retroperitoneal (primary) | rectum |
| retroperitoneal (primary) | kidney |
| retroperitoneal (primary) | suprarenal gland |
| retroperitoneal (primary) | testicle |
| intraperitoneal | stomach |
| intraperitoneal | liver |
| intraperitoneal | jejunum & ilium |
| intraperitoneal | cecum |
| intraperitoneal | appendix |
| intraperitoneal | transverse colon |
| intraperitoneal | sigmoid colon |
| intraperitoneal | spleen |