THORACIC CAVITY 



5 1 



Dissection. When the relations and prolongations of the fibrous peri- 

 cardium have been studied, the two anterior flaps already made in the 

 lateral walls of the sac (see p. 33) should be connected together and con- 

 verted into one large anterior flap. This can be done by a transverse cut, 

 passing across the median plane just above the diaphragm. The large 

 triangular flap thus formed should be thrown upwards towards the apex of 

 the pericardium. 



Left common carotid artery 

 Left vagus nerve 



Left subclavian artery- 

 Left innominate vein 



Trachea 



Left pulmonary 

 artery 



Left bronchu 



Left pulmonary 

 veins 



Right vagus ne 



Diaphragmatic 

 surface of heart 



Innominate artery 

 (Esophagus 



Right vagus nerve 



Superior vena cava 



Vena azygos 



Right posterior 

 pulmonary plexus 

 Right pulmonary 

 artery 



Right bronchus 



Right pulmonary 

 veins 



CEsophageal plexus 



Portion of peri- 

 cardium 



Left vagus nerve 

 Inferior vena cava 



FIG. 23. Posterior Aspect of the Heart with the Descending Aorta, the 

 Trachea and Bronchi, and the (Esophagus. 



The Serous Pericardium. The serous pericardium is a 

 closed and invaginated sac which lines the inner surface of 

 the fibrous sac and envelops the heart and the roots of the 

 great vessels passing to and from the heart. 



The uninvaginated portion of the wall of the serous sac, 



