312 



INTERNAL ANATOMY OF HORSE. 



opening between the left auricle and ventricle by the mitral 

 valve, which has two flaps only. The auricular portion can be 

 told from the ventricular by an external constriction. From 



Fig, 162. — Diagram of the Circulation of the Blood. 



LA and RA^ Left and right auricles; V, ventricles; L, lungs; Li, liver; J, intes- 

 tines ; A.VGj anterior or superior vena cava ; P.vc, posterior or inferior vciia cava ; A.a, 

 aortic arch ; A.ao, P.ao, anterior and posterior aorta ; Ha, hepatic artery ; Hv, hepatic 

 vein; Pv, portal vein; Pu.A, pulmonary artery; Pu.V, pulmonary veins ; Pc, posterior 

 capillaries; !/ 'of, thoracic duct. 



these chambers arise the blood-vessels. In the right auricle 

 (RA) we find three tubes — (i) the superior vena cava (Ave) ; 

 (ii) the inferiffr vena cava (P.vc) ; (iii) numerous small veins 



