DIGESTIVE SYSTEM. 



pancreas it descends (upper layer of transverse mesocolon) to 

 the transverse colon, covers the upper surface of this gut, and 

 descends as the anterior layer of the posterior fold of the great 

 omentum . [ 1 1 03] 



The anterior layer, traced vertically, covers the Spigelian lobe 

 and then descends (posterior layer of lesser omentum) from 

 the portal fissure and fissure of the ductus venosus to the lesser 

 curvature of the stomach, and runs over the visceral surface 

 to the greater curvature. Thence it descends as the posterior 

 layer of the anterior fold of the great omentum to meet the 

 posterior layer. [1102] 



Omenta. Of the two layers composing them, one is from 

 each sac. The lesser omentum is attached above to the margins 

 of the portal fissure and fissure of the ductus venosus, and 

 below to the lesser curvature of the stomach and the upper 

 border of the duodenum for an inch beyond the pylorus. It is 

 sometimes divided, according to its lower attachments, into 

 the hepato-gastric and hepato-duodenal ligaments. The right 

 border is free and bounds the foramen of Winslow; the left 

 end is narrow and attached to the diaphragm. The great 

 omentum is a large apron-like fold which is very fatty and 

 hangs down in front of the intestine. It consists of two folds, 

 each formed of two layers. The anterior (descending) fold 

 begins at the great curvature of the stomach, descends a vari- 

 able distance, then bends sharply backward and upward on 

 itself and ascends (posterior, or ascending fold) to the trans- 

 verse colon. In adult life the four layers become more or less 

 adherent. The gastro-splenic omentum is attached by one edge 

 to the wide end of the stomach, and by the other to the gastric 

 surface of the spleen just in front of the hilus. Its layers are 

 continuous with the great omentum below; superiorly they 

 separate at the "uncovered area" of the stomach. [1104] 



Ligaments. The phrenico-colic (sustentaculum lienis) runs 

 from the splenic flexure to the diaphragm opposite the eleventh 

 rib. The gastro-phrenic runs from the stomach, upward on the 



[229] 



