p. It. 



L 



Fk;. 50.— Diagram of the Fcetal Circulation. 



(Ellenberger— Bonnet.) 



, umbilical vein ; d. v., ductus venosus ; pt. v., portal vein ; /., liver : 

 r. h., hepatic veins ; p. r. c, posterior vena cava ; r. a., right auricle : 

 /'. (,., foramen ovale ; r. v., right ventricle : p. a., pulmonary artery ; 

 d. a., ductus arteriosus ; /. a., left auricle ; /. v., left ventricle ; a., the 

 aorta; a. a., arch of aorta; ant. a., anterior aorta ; i. v., innominate 

 veins ; a. v. c, anterior vena cava ; po. a., posterior aorta : i. a., illiao, 

 artery; h. a., hypogastric artery ; u. a., umbilical arteries ; i. ve., illiao 

 veins; h. v., hypogastric veins ; */. p., umbilical cord. The diagram 



actually represents the foetal circulation in ruminants: to make it 



applicable to the horse the ductus arteriosus (</. v.) must be supposed 



to be removed, the whole of the hlood then traverses the liver by 

 the union of the umbilical vein (11. r.) with the portal vein (pt. [>.). 



The arrows indicate the course taken by the blood : observe how 

 i he stream entering the tight auricle divides, pan passing into the 



right, ventricle, and part into the left auricle through the foramen 

 ovale (/. o. ). 



