From Wikipedia, the free encyclopedia. The peritoneal cavity is a potential space between the parietal peritoneum and visceral peritoneum, that is, the two membranes that separate the organs in the abdominal cavity from the abdominal wall.he peritoneal cavity is the largest serosal sac in the body and secretes approximately 50 ml of fluid per day. This fluid acts as a lubricant and has anti-inflammatory properties.
The appendix is located in the lower right portion of the abdomen.The spleen is tucked under the left side of the diaphragm.
Appendix is usually located in the right lower abdomen, between the navel and the upper part of the pelvic bone (Picture 1). The exact location differs from person to person, but is usually at or few inches around the McBurneyâs point â two thirds of distance between the navel and upper part of the pelvis (Picture 1).