198 



THE ENTODERMAL CANAL AND ITS DERIVATIVES 



trally by the lesser omentum (ventral mesentery). It communicates to the 

 right with the peritoneal cavity through an opening between the liver ventrally 

 and the plica vense cavae dorsally (Fig. 194). This opening is the epiploic fora- 

 men (of Winslow). When the dorsal wall of the stomach rotates to the left the 

 greater omentum is carried with it to the left of its dorsal attachment. Its tissue 



Body wall 



Inf. Vena Cava. 



Sup. recess 

 of lesser 

 peritoneal 



Pleuro-perilon 

 tnetnbrane 



Inf.vena. 

 cava. 



"Plica venae 

 Cavae 



Mesonephric 

 fold 



Genital 

 fold 



Fa/fciform ligament 



Coronary 

 attach menT of 

 Li ver to diaphragm 



~Pleuro - 

 perihneaL 

 'foramen 



Pleura- ) 

 peritoneal ( 

 membrane ) 

 Lesser 

 Omentum 



Greater 

 omentum 



Spleen 

 Stomach 



Lesser 



peritoneal Sac 

 Aorta. 



FIG. 193. A diagrammatic ventral view of the middle third of an embryo 12 to 15 mm. long. The 

 figure shows the caudal surface of a section through the stomach and spleen; a ventral view of the stom- 

 ach, the liver having been cut away to leave the sectioned edges of the lesser omentum and plica venae 

 cavas; and the caudal surface of the septum transversum and pleuro-peritoneal membrane. Upon the 

 surface of the septum is indicated diagrammatically the attachment of the liver (based on figures of Mall 

 and F. T. Lewis and model by H. G. Tracy). 



grows actively to the left and caudally and gives the omentum an appearance of 

 being folded on itself between the stomach and the dorsal body wall (Fig. 193). 

 The cavity of the lesser peritoneal sac is carried out between the folds of the 

 greater omentum as the inferior recess of the omental bursa. 



From the cranial end of the sac there is constricted off a small closed cavity which is 

 frequently persistent in the adult. This is the bursa infracardiaca and may be regarded as a 



