9 o 



THORAX 



auricle (appendage), for the portion which enters into the 

 formation of the sterno-costal surface is hidden by the roots 

 of the aorta and the pulmonary artery (Fig. 35). 



The posterior wall of the left atrium is of quadrangular 

 outline. Along its superior border lie the pulmonary arteries. 

 It is bounded inferiorly by the posterior part of the coronary 



Innominate artery 

 Right innominate 

 vein 



Right pulmonary 

 artery 



Right pulmonary 

 vein 



Left common carotid 



Aorta 

 Ligamentum arteriosum 



Left pulmonary artery 



Reflection of serous 

 pericardium 



Left 



pulmonary 

 veins 



Left atrium 



Oblique vei 

 Left ventric 



Coronary sulcus 



(O.T. Auriculo- 



ventricular groove) 



Coronary sinus 



Inferior surface of 

 ventricular part 

 of heart 



FIG. 45. Posterior or Basal Aspect of a Heart hardened in situ by 

 formalin injection. 



sulcus, in which lies the coronary sinus, and on the right by 

 an indistinct inter-atrial sulcus, which indicates the position 

 of the posterior border of the inter-atrial septum. Descending 

 obliquely across the posterior wall of the left atrium, from 

 the lower border of the left inferior pulmonary vein, down- 

 wards and to the right to the coronary sinus, is the oblique 

 vein (Marshall), which is the remains of the left duct of 



Right 

 pulmonary vein 



Right atrium 



Inferior vena 

 cava 



