
The retroperitoneal space (retroperitoneum) is the anatomical space (sometimes a potential space) in the abdominal cavity behind (retro) the peritoneum. It has no specific delineating anatomical structures. Organs are retroperitoneal if they have peritoneum on their anterior side only. Structures that are not suspended by mesentery in the abdomina...
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http://en.wikipedia.org/wiki/Retroperitoneal_space

An area occupying the most posterior aspect of the abdominal cavity. It is bounded laterally by the borders of the quadratus lumborum muscles and extends from the diaphragm to the brim of the true pelvis, where it continues as the pelvic extraperitoneal space. ... (12 Dec 1998) ...
Found on
http://www.encyclo.co.uk/local/20973

the space between the peritoneum and the posterior abdominal wall; called also retroperitoneum.
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Definitions: 1. the space between the parietal peritoneum and the muscles and bones of the posterior abdominal wall. Synonyms: spatium retroperitoneale, retroperitoneum
Found on
http://www.medilexicon.com/medicaldictionary.php?t=83170
No exact match found.