VASCULAR SYSTEM. 



713 



The right ventricle is not so muscular as the left, 

 which it partly surrounds. By its contraction the blood 

 is driven into the pulmonary trunk, whose orifice is 

 guarded by three semilunar valves. During contraction 

 the tricuspid valves are pressed together, so that no 

 regurgitation into the right auricle can take place. 



The pulmonary trunk 

 divides into two pulmonary 

 arteries, which branch into 

 capillaries on the walls of the 

 lungs. There the red blood 

 corpuscles gain oxygen, and 

 the blood is freed from much 



FIG. 391. Circulatory system of 

 the rabbit. 



(a) Letters to right 



e.c. External carotid. 

 i.e. Internal carotid. 

 e.j. External jugular. 

 scLa, Subclavian artery. 

 scl.v. Subclavian vein. 

 P.O.. Pulmonary artery (cut short). 

 p.v. Pulmonary vein. 

 L.A. Left auricle. 

 L.V. Left ventricle. 

 d.ao. Dorsal aorta. 

 h.v. Hepatic veins. 

 c. Coeliac artery. 

 a.m. Anterior mesenteric. 

 s.r.b. Suprarenal body. 

 Lr.a. Left renal artery. 

 l.r.v. Left renal vein. 



K. Kidney. 



p.m. Posterior mesenteric artery 

 (inadvertently shown as if 

 paired}. 



spm. Spermatic arteries and veins. 

 c.il.a. Common iliac artery. 

 ((>) Letters to left 



p.f. and a.f. Posterior and anterior 



facial. 



e.j. External jugular vein. 

 i.j. Internal jugular. 

 R.Scl. Right subclavian artery. 

 S. V.C. Superior vena cava. 

 R.A. Right auricle. 

 R.V. Right ventricle. 

 /. V.C. Inferior vena cava. 

 r.r.a. Right renal artery. 

 r.r.v. Right renal vein. 

 s.r.b. Suprarenal body. 

 spm. Spermatic arteries and veins. 

 i.l. Ilio-lumbar vein. 

 f.v. Femoral vein. 

 i il.v. Internal iliac veins. 



