VASCULAR SYSTEM. 



687 



right auricle. Thence the blood passes into the right ventricle 

 through a crescentic opening, bordered by a threefold (tricuspid) 

 membranous valve (worked by chordae tendineae attached 

 to papillary muscles projecting from the wall of the ventricle). 

 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 tri- 

 cuspid valves are pressed 

 together, so that no regurgita- 

 tion into the right auricle can 

 take place. 



FIG. 340. Circulatory system of the 

 rabbit. In part after Parker and 

 Krause. 



(a) Letters to right 



e.c. External carotul. 

 i.e. Internal carotid. 

 c.j. External jugular. 

 scl.a. Subclavian artery. 

 scl.v. Subclavian vein. 

 p.a. Pulmonary artery (cut short). 

 p.v. Pulmonary vein. 

 L.A. Left auricle. 

 L.V. Left ventricle. 

 d.ao. Dorsal aorta. 

 //.r'. Hepatic veins. 

 c. Coeliac artery. 

 a.m. Anterior mesenteric. 

 .<.;-./>. Suprarenal body. 

 l.r.a. Left renal artery. 

 l.r.i'. Left renal vein. 



K. Kidney. 



p.m. Posterior mesenteric artery. 

 spin. Spermatic artery and vein. 

 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. 

 .V. / ~.C. Superior vena cava 

 R.A. Right auricle. 

 R.l'. Right ventricle. 

 /. /".C. Inferior vena cava. 

 r.r.a. Right renal artery. 

 r.r.v. Right renal vein. 

 s.r.b. Suprarenal body. 

 s.p.ut. Spermatic artery and vein. 



/./. Ilio-lumbar vein. 

 f.v. Femoral vein. 

 zY/.z'. Internal iliac veins. 



LA 



