n8 



THORAX 



the left border.. The only part which can be seen from the 

 front, when the heart and great arteries are in situ> is the 

 apical portion of the 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. 39)- 



Left common carotid 



Aorta 

 Ligamentum arterios 



Left pulmonary artery 



Reflection of serous 

 pericardium 



Innominate artery 

 Right innominate 



Vena azygos 



Superior 

 vena cava 



Right pulmonary 

 artery 



Right pulmonary 

 vein 



Sulcus 

 terminalis 



Right 

 pulmonary vein 



Interatrial 

 sulcus 



Right atrium 



Inferior vena 

 cava 



Oblique vei 

 Left ventricle. 



Coronary sulcus 

 (O.T. Auriculo- 

 ventricular groove) 



Coronary sinu 



Inferior surface of 

 ventricular part 

 of heart 



FIG. 59. Posterior or Basal Aspect of a Heart hardened in situ by 

 formalin injection. 



The posterior wall of the left atrium is of quadrangular 

 outline. Along its superior border lie the right and left 

 pulmonary arteries. It is bounded inferiorly by the posterior 

 part of the coronary sulcus, in which lies the coronary sinus, 

 and on the right by an indistinct interatrial sulcus, which 

 indicates the position of the posterior border of the interatrial 

 septum. Descending obliquely across the posterior wall of 



