176 



Heart. 



A.anonyma 



Carot.sin. 



\subclav.sin. 



V.cava- 

 super. 



V.cava- 

 irifer. 



518. The Heart and Larffe Vessels. 



o 



View from before, */ 2 natural size. 



The heart, Cor, is a hollow, muscular organ of a conical form, 

 which projects further into the left than into the right half of the chest, 

 and lies between the concave surfaces of the lungs. It consists of a 

 base, directed upwards, backwards and to the right, and of an apex, 

 directed downwards, forwards and to the left; also of a convex anterior 

 surface, a flattened posterior surface and two lateral b o r- 

 d e r s. Two longitudinal s u 1 c i, situated one on the anterior, the 

 other on the posterior surface, divide the heart into a right and a 

 left half; these sulci are -continuous one with the other a little to the 

 right of the apex; the anterior is nearer to the left and the posterior 

 nearer to the right side of the heart. Both halves are again divided by 

 a deep transverse groove, which is plainly visible only at the 

 posterior surface of the heart. 



