216 



THE HUMAN BODY. 



branches are given off, Ssi, Cs, Ab; but before that, close to 

 the heart, the aorta gives off two coronary arteries, branches 

 of which are seen at crd and crs lying in the groove over the 

 partition between the ventricles, and which carry to the sub- 

 stance of the organ that blood which comes back through the 



FIG. 91. -The heart viewed from its dorsal aspect. Atd, right auricle; ci, in- 

 ferior vena cava; Fc, coronary vein. The remaining letters of reference have 

 vhe same signification as in f ig. 90. 



coronary sinus. Into the ]eft auricle open two rigM and two 

 left pulmonary veins, ps and pd, which are formt^ by the 

 union of smaller vein^ proceeding 1 from the lungs. 



In the diagram Fig. 89 from which the branches of the 

 great vessels near the heart have been omitted for the .sake 

 of clearness, the connection of the various vessels with the 



