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Anatomy_Flashback:
Retro: Behind.
Peritoneal cavity: serous Membrane that encircles most of the intra-abdominal viscera.
Retoperitoneal: behind the cavity.
Retoperitoneal space contain the kidneys, ureters, pancreas, most of the duodenum, colon(except transverse and sigmoid colon), iliopsoas muscles and major blood vessels.
Secondary retropretonieal organs(Ascending abd descending colon and duodenum) , means that during early developmental stage where intra peritoneal (I.e. Covered entirely with serous membrane).
Bowel layers is as follow: Mucosa, Submucosa, Muscularis Propria and #Serosa (if intraperitoneal) or #Adventitia if retropretonieal.
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Image:
Osmosis.org
