602 



GENERATION AND DEVELOPMENT. 



the blood of the inferior vena cava which has not gone into 

 these large vessels, it is distributed with it to the trunk and 

 lower parts, a portion passing out by way of the two umbili- 



FIG. 234. 



cal arteries to the placenta. From the placenta it is returned 

 by the umbilical vein to the under surface of the liver, from 

 which the description started. 



After birth the foramen ovale closes, and so do the ductus 



