7 6 



THORAX 



the cavity of the atrium proper and the venous sinus of the 

 atrium, into, which the great veins open. 



The whole of the right border of the heart is formed by 

 the right atrium. Its position can be indicated on the surface 



Right common carotid artery 

 Opening of right internal jugular vein 



Right subclavian artery. 

 Right subclavian vein 



Innominate artery ^ 



Superior vena cava 

 Right phrenic nerve 



Eparterial branch of 

 right bronchus 



Pulmonary artery 



Upper right pulmonary 



vein 



Right auricle 

 (O.T. appendix) 



Right atrium 



Inferior vena cava 





Left common carotid artery 



nd of left internal jugular vein 

 Left subclavian artery 

 : Left subclavian vein 



Left phrenic nerve 

 Cut edge of peri- 

 cardium 

 Ascending aorta 



Root of pulmonary 

 artery 



Coronary sulcus 

 (O.T. auriculo- 

 ventricular) 



Right ventricle 



Anterior longi- 

 tudinal sulcus 

 Left ventricle 



Cut edge of 

 pericar- 

 dium 



FlG - 33- Dissection of the Middle and Superior Parts of the Mediastinum 

 from the anterior aspect. 



by a line, convex to the right, which commences at the level 

 of the third right costal cartilage, half an inch from the 

 sternum, and terminates opposite the sixth right cartilage at 

 the same distance from the right margin of the sternum. 1 At 



1 When the right side of the heart is distended the lower end of the right 

 border of the right atriurn descends to the back of the seventh right costal 

 cartilage. 



