270 



HtlMAN EMBRYOLOGY AND MORPHOLOGY. 



Relationship of the Pancreas to the Peritoneum and Vessels. 

 1. In the Embryo. — The pancreas develops between the layers 

 of the dorsal mesogastrium (Fig. 216); it is completely sur- 



ipleen. 

 coron. art. 

 — diaph. 



ab. aorta 

 splenic art 



coeliac axis 

 great omentum 



sup. mesent. art. 



hepatic art. 

 hepatic 



ventral mesentery 



Fig. 219.- 



-The Arrangement of Vessels in the Dorsal 

 week (diagrammatic). 



Mesogastrium during the 5th 



rounded by peritoneum, and it lies with its tail directed forwards 

 against the spleen and its head on the dorsal bend of the 

 duodenum. It is parallel to the great curvature (dorsal border) 

 of the stomach. This is the relationship during the 5th and 6th 

 weeks. The dorsal mesogastrium is then attached in the middle 

 line, in front of the aorta. The coeliac axis (Fig. 219) is the 

 artery of the mesogastrium and of the structures which it con- 

 tains. It supplies the fore-gut and its derivatives, between the 

 septum transversum in front and yolk sac behind. The coronary 

 artery passes direct to the cardiac end of the stomach ; the 

 splenic is a short vessel ending on the cardiac dilatation of the 

 stomach and supplying the spleen ; the hepatic passes on the 

 right side of the pancreas to the duodenum and pyloric end of 

 the stomach, and ends in the liver by passing through the ventral 

 mesentery. 



2. In the Adult. — The development of the great omentum 



