THE ANATOMY OF THE HEART AND BLOOD-VESSELS 327 



corresponding lungs. Opening into the right auricle are two 

 great veins (see also Fig. 101), cs and ci, known respectively as 

 the upper and lower vence cavce, or " hollow" veins; so called by the 

 older anatomists because they are frequently found empty after 



FKJ. KK3. The heart viewed from its dorsal aspect. Aid, right auricle; ci, in- 

 ferior vena cay a; Vc, coronary vein. The remaining letters of reference have the 

 same signification as in Fig. 102. 



death. Into the back of the right auricle opens also another vein, 

 Vc, called the amtn-nry vein or .sinus, which brings back blood 

 that has circulated in the walls of the heart itself. Springing from 

 the left ventricle, and appearing from beneath the pulmonary 

 artery when the heart is looked at from the ventral side, is a great 



