240 



TEXT-BOOK OF EMBRYOLOGY. 



V 



w/ 



FAG. 214. Surface view of area vasculosa of a rabbit embryo of n days, van Beneden andJulin. 

 The vessel around the border is the sinus terminalis; the two large vessels above the embryo are 

 . the vitelline (omphalomesenteric) .veins; the two large vessels converging below the embryo 

 are the vitelline (omphalomesenteric) arteries. 



Dors, aortic root 

 and aortic arches 



Ant. cardinal vein 



Amnion 



Post, cardinal vein 

 Aorta - 



Belly stalk 



Chorionic villi - - 



FIG. 215. Human embryo of 3.2 mm. His. The arrows indicate the 

 direction of the blood current. 



