130 
ELEMENTS OF MAMMALIAN ANATOMY. 
The opening between the left auricle and the left ventricle 
is guarded by the bicuspid or mitral valve. 
Fic. 68. PHoTocRAPH OF THE VEN- 
TRAL ASPECT OF THE HUMAN 
Heart INJECTED. 
a, aorta; b, left ventricle; c, carotid 
arteries; d, right auricle; e, 
esophagus; J, left auricle; 1, 
right auricle; s, subclavian ar- 
tery; ¢t, trachea; wv, superior 
vena cava. 4 natural size. 
These valves 
Heart VIEWED VEN- 
FiG. .60; 
TRALLY, WITH VENTRAL HALF oF 
THE AURICLES AND VENTRICLES 
Cut AWAY AND THE AURICLES 
Drawn LaterAp. Partly dia- 
grammatic. 
Orifice of the aorta; ao, aorta; 
aao, arch of the aorta; ap, orifice 
of the precava; as, orifice of the 
postcava; lv, left pulmonary 
veins; lun, left ventricle; mt, 
mitral or bicuspid valve; /a, left 
auricle; p, orifice of the pulmon- 
ary veins; pce, inferior vena 
cava; pre, 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 chorde tendince, 
delicate tendinous cords, will be seen extending from the 
