CHAP, vii THE STAGES OF LIFE AND DEATH 267 



through the superior vena cava; this mixture is however really 



FIG. 118. Course of the umbilical vessels in the foetal body. (Fr. Meckel.) Median section of 

 the body of the foetus. 1, inferior vena cava ; 2, liver ; 3, umbilical vein ; 4, umbilical arteries ; 

 5, urinary vesicle ; 6, hypogastric artery ; 7, external iliac artery ; 8, portal vein ; 9, ductus 

 venosus Arantii ; 10, descending aorta. 



only partial, since by means of an anatomical arrangement the 

 so-called Eustachian valve (Fig. 116) with which the entrance 



