DEVELOPMENT OF THE VEINS 



269 



Atrium 



Common cardinal vein 



Sinusoids of liver 



Right vitelline vein 



Ventricle 



Left umbilical vein 

 Left vitelline vein 



FIG 279. Reconstruction of the blood vessels of a 4.2 mm. human embryo in ventral view 



(His). 



Ductus venosut 



Right horn of sinus venosus 



Caudal anastomosis of vilelline veins 



Right vitelline vein 



Left horn of sinus venosus 

 Left vitelline vein 



Cranial anastomosis of vitelline 

 veins 



Middle anastomosis of vitelline 

 veins 



Right umbilical vein -^ ^Jfc I ^ ^"~ " mbilical vein 



\\ I 

 ns 



-Left vitelline vein 



FIG. 280. Reconstruction of the veins of the liver in a 4.9 mm. human embryo (after Ingalls). 



