[Illustration: FIG. 283.--Schema of lines of reflection of peritoneum on dorsal surface of liver and in the formation of the gastro-hepatic omentum. _A B_, transverse section of lesser omentum attached to transverse fissure of liver and to pyloric section of lesser curvature (_A' B'_); _B C_, vertical section of lesser omentum passing between fissure of ductus venosus and cardiac section of lesser curvature of stomach (_B' C'_); _C D_, line of reflection of peritoneum from cephalic border of Spigelian lobe to diaphragm; _D E_, line of reflection of peritoneum from right border of Spigelian lobe to left margin of postcava and diaphragm.] [Illustration: FIG. 284.--Portion of abdominal viscera of adult human subject, hardened _in situ_. (Columbia University, Study Collection.) The segment of stomach between cardiac and pyloric orifices has been removed, dividing the lesser omentum to this extent, but leaving the right extremity of the membrane (lig. hepato-duodenale) intact. Behind this portion the arrow passes through the foramen of Winslow.] [Illustration: FIG. 285.--Liver and stomach of _Macacus pileatus_. (Columbia University, Study Collection.)] Fig. 284 shows this right-angled course of the lesser omentum at the hepatic line of attachment in a preparation of the abdominal viscera hardened in situ, with the segment of the stomach between the cardiac and pyloric orifices removed. The arrow is passed behind the right free edge of the lesser omentum. This portion of the membrane is still intact, not having been disturbed by the removal of the body of the stomach, and includes between its layers the structures connected with the liver at the transverse fissure (duct, hepatic artery and portal vein). The lesser omentum is seen to be attached to the liver along the transverse fissure (Fig. 284, _A_) and along the fissure for the ductus venosus (Fig. 284, _B_), constituting the transverse and vertical segments above referred to, which pass into each other at the angle of junction between the transverse fissure (left end) and the fissure for the ductus venosus (Fig. 284, _C_). The caudal and left border of the Spigelian lobe is exposed by the division of the omentum, and the extent of the Spigelian or hepatic recess of the lesser peritoneal sac is shown. Fig. 285 shows the liver, stomach and lesser omentum of a Macaque monkey hardened in situ, and demonstrates still more conclusively that the uniform curve of the omentum along the lesser curvature of the stomach becomes a broken line at the hepatic attachment, the angle being placed at the left end of the transverse fissure at the point where the same encounters the fissure for the ductus venosus. [Illustration: FIG. 286.--Abdominal viscera of adult human subject, hardened _in situ_; with liver lifted up after incision of the gastro-hepatic omentum. (Columbia University Museum, No. 1845.)]