Relationship between abdominopelvic viscera and peritoneum Intraperitoneal organs Organ almost surrounded completely by peritoneum Stomach jejunum, ilium, cecum, appendix, transverse sigmoid colons etc intraperitoneal viscera parietal peritoneum (small intestine) mesentery interperitoneal interperitoneal viscera vIscera (descending colon) (ascending colon retroperitoneal viscera (kidney) abdominal aorta inferior vena cavaRelationship between abdominopelvic viscera and peritoneum Intraperitoneal organs Organ almost surrounded completely by peritoneum.Stomach, jejunum, ilium,cecum,appendix,transverse & sigmoid colons etc