part of part of located in located in organ subunit peritoneal cavity lesser sac http://upload.wikimedia.org/wikipedia/commons/c/c5/Peritoneum.svg classified as a cavity in EHDAA2, so this truly corresponds to FMA 'Cavity of lesser sac' - we hedge for now; todo - treat same as greater sac UBERON:0001341 NCIT:C81014 The lesser sac, also known as the omental bursa, is the cavity in the abdomen that is formed by the lesser and greater omentum. Usually found in mammals, it is connected with the greater sac via the epiploic foramen (also known as the Foramen of Winslow). [WP,unvetted]. FMA:19800 MA:0000445 The lesser sac of the peritoneum. Part of the peritoneal cavity behind the liver, lesser omentum and stomach. It lies across the transverse mesocolon and extends into the greater omentum. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] EMAPA:16889 In mammals, it is not uncommon for the lesser sac to contain considerable amounts of fat. In human anatomy, the wall of the stomach, pancreas and splenic artery are a part of the wall of the lesser sac EHDAA:2335 EHDAA2:0004554 omental bursa The lesser sac is embryologically formed from an infolding of the greater omentum. The open end of the infolding, known as the epiploic foramen, is usually proximal to the stomach Wikipedia:Lesser_sac EHDAA2:0001296 bursa omentalis VHOG:0000458 UMLS:C0230212 peritoneal sac