840 



DEVELOPMENT. 



[CH. LVIII. 



the right ventricle, is sent out thence in small amount through 

 the pulmonary artery to the lungs, and thence to the left auricle, 

 by the pulmonary veins, as in the adult. The greater part, 

 however, does not go to the lungs, but instead, passes through a 



"jm 



R Luny--- 

 Jt Auricle-- 







- -\- - ->r - \-jlortie 



\ PttlmT 



' Is y****~ 



- 659. Diagram of the Foetal Circulation. 



canal, the duetus arteriosus, leading from the pulmonary artery 

 into the aorta just below the origin of the three great vessels 

 which supply the upper parts of the body ; and there meeting 

 that part of the blood of the inferior vena cava which has not 

 gone into these large vessels, it is distributed with it to the 



