Chap. XII] GENERAL CIRCULATION OF BLOOD 225 



^^^J^IS^^ 



OESCE 

 CAVA 



ARTERIAL BLOOD 



VENOUS. BLOOD 



Fig. 138. — Diagram of Circulation before Birth. Foetal type. (Cooke.) 



Course of the blood. — The oxygenated blood for the nutrition 

 of the foetus is carried from the placenta along the umbilical 

 cord by the umbilical vein. Entering the foetus the blood is 



