700 



THE THORAX. 



FCETAL CIRCULATION. 



In the following plan the figured arrows represent the kind of 'Mood, as well as the 



direction which it takes in the vessels. Thus arterial blood is figured > > ; 



venous blood, > >; mixed (arterial and venous blood), 28>" >. 



Fig. 354. Plan of the Foetal Circulation. 



Jn!r.nal lUac J$T 



The arterial blood destined for the nutrition of the foetus is carried from the 

 placenta to the foetus, along the umbilical cord, by the umbilical vein. The 

 umbilical vein enters the abdomen at the umbilicus, and passes upwards along the 



