<prompt> Lesser sac of stomach is bounded by:Posterior wall of stomachVisceral surface of spleenUnder surface of liverAll  <response>: A. i.e. Posterior wall of stomach - Lesser sac Omental bursa is bounded anteriorly by stomach, caudate lobe of liver, lesser omentum greater omentum ant. 2 layers; and posteriorly by structures forming stomach bed i.e. diaphragm, pancreas, spleen etc greater omentum posterior 2 layers Lesser sac or omental bursa is the site for abscess formation in posterior perforation of gastric ulcer and internal hernia through epiploic foramen 