632 



VETERINARY PHYSIOLOGY 



through the organ, and into a series of capillaries among the 

 cells. From these the blood flows away in the hepatic vein to 

 the inferior vena cava, p.v.c, and mixed blood passes to the 

 right auricle. In this it is directed by a fold of endocardium, 



/t.a. 



pt.V. 



Jl.V.C. 



.u.c. 



A.v. 



••'i, 



ct 



Fig. 245. — Scheme of Circulation in the Fretus, u.v., umbilical vein ; fZ.y., 

 ductus veuosus ; p.v.c., inferior vena cava pouring blood through the 

 right auricle and through the foramen ovale, f.o., into the left heart ; 

 a.t'.c, superior vena cava bringing blood from the head to pass through 

 the right side of the heart, and through the ductus arteriosus, d.a. ; 

 pt.V., portal vein. The degree of impurity of the blood is indicated by 

 the depth of shading. 



through the foramen ovale, f.o., a hole in the septum between 

 the auricles, and it thus passes to the left auricle, and thence to 

 the left ventricle, l.v., which drives it into the aorta, a.a., and 

 chiefly up to the head, ant.a. From the head the blood returns 

 to the superior vena cava, a.v.c, and, passing through the right 



