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Intraperitoneal and Retroperitoneal Organs

Major Intraperitoneal Organs: (suspended by a mesentery)


  • Stomach
  • Liver and Gallbladder
  • Spleen
  • Duodenum, 1st part
  • Tail of pancreas
  • Jejunum
  • Ileum
  • Appendix
  • Transverse colon
  • Sigmoid colon


Major Secondary Retroperitoneal Organs : (loss of mesentery during development)


  • Duodenum 2 & 3 parts
  • Head ,neck, & body of pancreas
  • Ascending colon
  • Descending colon
  • Upper rectum


Major Primary Retroperitoneal Organs : (never had a mesentery)


  • Kidneys
  • Adrenal glands
  • Ureters
  • Aorta
  • Inferior vena cava
  • Lower rectum 
  • Anal canal
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