TRANSVERSE SECTIONS OF A SIX MM. PIG EMBRYO 



109 



The right posterior cardinal vein is broken up into mesonephric sinusoids. The vein in the 

 plica venae cavae will, a few sections lower, connect with the right subcardinal vein. The an- 

 lage of the dorsal pancreas is seen extending from the duodenum dorsad into the mesenchyme 



NotocJioi 



Post, cardinal vein 



Dorsal aoria 



Inf. vena cava 



Portal vc 



R. umbilical vc 



Hepatic diverticuhi 



Perilonc 



jst. cardinal vein 



Upper limb bud 



Dorsal mesogastriiim 

 Dorsal lobe liver 



vitelline vein 

 umbilical vein 



Fig. 112. — Transverse section through the hepatic diverticulum of a 6 mm. pig embryo. X 26.5. 



of the mesentery. It soon bifurcates into a dorsal and right lobe, of which the latter is slightly 

 lobulated. Ventro-lateral to the duodenum the anlage of the ventral pancreas is seen cut 

 iicross. It may be traced cephalad in the series to its origin from the hepatic diverticulum. 



S final cord 



Dorsal aorti 

 R. post, cardinal veil 



Glomerulus of mesonephro^ 

 Inf. vena 1 



Portal c n 

 R. umbilical vein 



Distal end of hepatic divciiiculum 



L. post, cardinal vein 

 Mesonephros 

 Upper limb bud 



Mesentery 

 Dorsal pancreas 

 L. vitelline vein 

 D odcnum 

 L. luiibilical vein 



Ventral pancreas 

 Fig. 113. — Transverse section through the dorsal pancreas of a 6 mm. pig embryo. X 26.5 



To the right of the ventral pancreas lies the portal vein (at this level a portion of the right 

 vitelline). To the left of the dorsal pancreas is seen the remains of the left vitelline vein. 

 The ventral lobes of the liver are just disappearing at this level. In the mesenchyme which 



