Daniel G. Revell 



447 



primitive embryonic ami the derived adult condition in the dog. The 

 right limb is in the mesodiiodennm and retains this position. The left 

 limb is contained in the mesogastrium and the whole gland may be 

 regarded as in one plane (A). The bursa omentalis being formed by 

 a pocketing of the mesogastrium between the stomach and the pan- 

 creas, and the dorsal margin of the left limb of the latter being fixed. 



O.mi. 



o.ma. 





D 



duo.. 



po 



p.m 



md. 



b.om.. 



K. 



4 



Fig. 4. — Scheme of development of the peritoueal relations of the pancreas in dog. 

 In D and E are shown the part of the splenic division adjacent to the bowel, xx in- 

 dicates the same border in each. 



while the ventral margin is carried caudalward by the omentum niajus, 

 the twist results (C). The duodenal end is fixed or probably carried 

 cranialward with the p3'lorus, v/hile the splenic end is carried caudal- 

 ward as the alimentary canal elongates and is thrown into curves. 

 Thus the left limb becomes directed caudo-sinistralward. Except 

 where it is in contact with the duodenum, the pancreas has everywhere 

 a free surface covered by peritoneum. 



