extraperitoneal space extraperitoneal space the extraperitoneal space is the portion of the abdomen and pelvis which does not lie within the peritoneum. extraperitoneal spacedetailsidentifierslatinspatium extraperitonealeta98a10.1.01.001ta23813fma14730anatomical terminology it includes: retroperitoneal space, situated posteriorly to the peritoneum preperitoneal space, situated anteriorly to the peritoneum retropubic space, deep to the pubic bone retro-inguinal space, deep to the inguinal ligament the space in the pelvis is divided into the following components: prevesical space perivesical space perirectal space