In front of the peritoneum.
* * *
pro·peri·to·ne·al (')prō-.per-ət-ən-'ē-əl adj lying between the parietal peritoneum and the ventral musculature of the body cavity <a \properitoneal herniated mass> <\properitoneal fat>
* * *
pro·peri·to·ne·al (pro″pər-ĭ-to-neґəl) preperitoneal.Medical dictionary. 2011.