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.
hog:0000458 omental bursahog:0000858 greater sachog:0001257 peritoneumBFO:0000050 part of
hog:0000316