<prompt> Most dependent pa of abdomen in standing position isVesicouterine pouchPouch of douglasMorrison pouchLeft paracolic gutter  <response>: The recto-uterine pouch cul-de-sac or pouch of Douglas is the extension of the peritoneal cavity between the rectum and the posterior wall of the uterus. It is the most inferior aspect of the peritoneal cavity and therefore the first location where free fluid accumulates . ref - BDC 6e vol2 pg244 