PERICARDIUM, PLEUROPERITONEUM, DIAPHRAGM AND MESENTERIES. 381 



with the transverse mesocolon and transverse colon (Fig. 341). During th< 

 first or second year after birth the two lamellae fuse with each other cauda 

 to the transverse colon to form the greater omentum of adult anatomy. 



Diaphragm 



Liver-, 

 Lesser omentum.^ 



Pancreas-^ 

 Bursa omentalis--.. 



Stomach 



Greater omentum 



Duodenum 



Transverse mesocolon - 

 Transverse colon - 



Mesentery of __ - 

 small intestine" 



Small intestine 



PIG. 339- 



Diaph. 



FIG. 340. FIG. 341. 



FIGS. 339, 340 and 341. Diagrams showing stages in the development of the bursa omentalis, th< 

 greater omentum, and the fusion of the latter with the transverse mesocolon. Diagram; 

 represent sagittal sections. For explanation of lettering in Figs. 340 and 341 see Fig. 339. 



The Lesser Omentum. It has already been noted that the liver grows intc 

 the caudal portion of the septum transversum (p. 376). Since the ventral 

 mesentery in the abdominal region, or the ventral mesogastrium, is primarily 



