peritoneal cavity [Gk, peri + teinein, to stretch] , the potential space between the parietal and visceral layers of the peritoneum, which are normally in contact. The peritoneal cavity is divided into the greater and lesser sac. The greater sac is the peritoneal cavity, and the lesser sac is the omental bursa. The omental bursa is associated with the dorsal surface of the stomach and the surrounding structures. See also omental foramen.
