ANATOMY OF THE HEART AND BLOOD-VESSELS 293 



gives off two coronary arteries, branches of which are seen at crd 

 and crs lying in the groove over the partition between the ventri- 

 cles, and which carry to the substance of the organ that blood 

 which comes back through the coronary sinus. Into the left au- 



FIG. 104. The heart viewed from its dorsal aspect. Aid, right auricle; ci, in- 

 ner vena cava: Vc. coronarv vein. The remaining letters of reference have the 



ferior vena cava; c, coronar 

 same signification as in Fig. 103. 



ricle open two right and two left pulmonary veins, ps and pd, 

 which are formed by the union of smaller veins proceeding from 

 the lungs. 



In the diagram Fig. 102 from which the branches of the great 

 vessels near the heart have been omitted for the sake of clearness, 



