THE THORAX AND THORACIC VISCERA. 81 



Right pulmonary artery : 



Relations : In its course to the lung : 

 In front. 

 Behind. 

 Above. 

 Below. 



At the root of the lung : 

 Above and behind. 

 Below and in front. 

 Left pulmonary artery : 



Relations at the root of the lung : 

 Behind and below. 

 Below and in front. 

 Pulmonary veins, 639. (626-7) 

 Root of the lung, 960-1. (939-40) 



Pulmonary artery, pulmonary vein, bronchial tube, bronchial vessels, 

 anterior and posterior pulmonary plexuses, lymphatic glands, areorar 

 tissue all encased in a pleural covering. 

 Right root. 

 Left root. 



Arrangement of structures within the root : 

 From above downward : 

 Right side. 

 Left side. 



From before backward. 

 Right vagus nerve, 817. (798) 

 Left vagus nerve, 817. (798) 



Inferior or recurrent laryngeal nerve, 818-19. (799-800) 

 Of the right side. 

 Left side. 

 Posterior pulmonary plexus, 819. (800) 



Divide the superior vena cava just below the termination of the vena azygos major (642 ; Fig. 382). 

 Divide the right pulmonary artery near the right lung; draw the arch of the aorta and the base of the 

 heart forward and to the left and expose the deep cardiac plexus, tracing the branches to and from it. 

 The thoracic portion of the trachea and the bronchial tubes will also be exposed. 



Cardiac plexus, 869-70. (849-50) 



Deep cardiac plexus. 

 Cardiac branches of the pneumogastric and sympathetic nerves, 819, 867. (800, 847) 



Superior cervical cardiac nerve. 



Middle cardiac nerve. 



Inferior cervical cardiac nerve, right. 



Thoracic cardiac branches. 

 Right coronary plexus, 870. (850) 

 Left coronary plexus, 870. (850) 

 Trachea or air tube, 9501. (929) 



Thoracic portion. 

 The bronchi, 952. (931) 



Right bronchus : 

 Relations. 



Left bronchus : 



Relations. 



Bronchial glands, broncho-mediastinal trunk, 697-8. (682) 

 Expose the oesophagus and trace the pneumogastric nerves to the diaphragm. 



(Esophagus, 987-8. (966-7) 

 In the thorax : 



Relations: In front. 

 Behind. 

 Laterally. 



