Pouch of Douglas is between:September 2006, March 2013

Rectouterine pouch (pouch of Douglas) is the most dependent pa of the entire peritoneal cavity (when the patient is in the standing position), hence it frequently becomes the site for the accumulation of blood (from a ruptured ectopic pregnancy) or pus (from a ruptured pelvic appendicitis or in gonococcal peritonitis).Because the pouch lies directly behind the posterior fornix of the vagina, it is commonly violated by misguided nonsterile instruments, which pierce the wall of the posterior fornix in a failed attempt at an illegal aboion.A needle may be passed into the pouch through the posterior fornix in the procedure known as culdocentesis.Surgically, the pouch may be entered in posterior colpotomy. The interior of the female pelvic peritoneal cavity may be viewed for evidence of disease through an endoscope.