1 3 o 



ELEMENTS OF MAMMALIAN ANATOMY. 



The opening between the left -auricle and the left ventricle 

 is guarded by the bicuspid or mitral valve. These valves 



FIG. 68. PHOTOGRAPH OF THE VEN- 

 TRAL ASPECT OF THE HUMAN 

 HEART INJECTED. 



a, aorta ; b, left ventricle ; c, carotid 

 arteries ; d, right auricle ; e, 

 esophagus; /, left auricle; n, 

 right auricle; s, subclavian ar- 

 tery; t, trachea; v, superior 

 vena cava. J natural size. 



FIG. 69. HEART VIEWED VEN- 

 TRALLY, WITH VENTRAL HALF OF 

 THE AURICLES AND VENTRICLES 

 CUT AWAY AND THE AURICLES 

 DRAWN LATERAD. Partly dia- 

 grammatic. 



a, Orifice of the aorta ; ao, aorta ; 

 aao, arch of the aorta ; ap, orifice 

 of the precava ; as, orifice of the 

 postcava; Iv, left pulmonary 

 veins ; Ivn, left ventricle ; mt, 

 mitral or bicuspid valve ; la, left 

 auricle; p, orifice of the pulmon- 

 ary veins; pc, inferior vena 

 cava; prc, superior vena cava; 

 ba, orifice of the pulmonary 

 artery; prv, right pulmonary 

 veins ; rv, right ventricle and 

 one of the right pulmonary 

 veins ; ra, right auricle ; rp, right 

 pulmonary artery ; tr, tricuspid 

 valve; xp, left pulmonary artery. 



may be displayed by cutting away the caudal half of the 

 ventral wall of the ventricles, when the chorda tendinea, 

 delicate tendinous cords, will be seen extending from the 



