THE HEART. 



585 



vmtriculnr groove) parallel to the axis of the heart, and which divides this face 

 into two sections — an anterior, belonji;in<r to the rit^ht ventricle ; and a posterior, 

 less extensive, forming part of the left ventricle (Fig. :^50). 



The left face, disposed in the same manner, also shows a groove {left ventri- 

 cular groove) on the limit of the two ventricles, which slightly crosses the large 

 diameter of the heart from behind to before, and above to below, and is much 

 nearer the anterior than the posterior border (Fig. 341)). 



Fig. 349. 



THE HEART AND PRINCIPAL VESSEI^ (LEFT FACE). 



a, Right ventricle ; 6, left ventricle ; c, right auricle ; d, left auricle ; e, pulmonary artery ; #*, 

 obliterated ductus arteriosus; /, pulmonary veins; g, anterioi aorta; h, left axillary Mrtery; 

 i, right axillary artery, or brachio-cephalic trunk ; j, origin of the dorsal artery ; k, origin of the 

 superior cervical artery ; /, origin of the vertebral artery ; m. origin of the inferior cervical 

 artery; n, origin of the internal thoracic artery; o, origin of the external ditto; p, carotid 

 arteries ; q, posterior aorta ; r, anterior vena cava ; s, trunk of the axillary vein ; t, trunk of the 

 internal thoracic vein ; u trunk of the dorso-cervical vein; r, posterior vena cava; exjunction 

 of the hepatic and diaphragmatic veins; x, vena azygos ; y, thoracic duct; z, embouchure of 

 that vessel, placed near the origin of the anterior vena cava. 1, Right cardiac artery ; 2, left 

 cardiac artery ; 3, auriculo-ventricular branch of the latter; 4, its ventricular branch ; 5, cardiac 

 vein. 



These two faces are related, through the medium of the pericardium, to the 

 plurae and pulmonary lobes ; the latter separate them from the thora.x, except 

 towards the middle and apex of the organ, where these faces come directly in 

 contact with the thoracic parietes through the notch at the inferior border of the 

 lung, and which is more marked in the left than in the right. 



The borders are thick, smooth, and rounded. The anterior, formed by the 



