THE LUNGS 



923 



The right lung is somewhat larger than the left; it i.s also shorter, and, as just 

 mentioned, possesses three lobes. 



Above the middle of the inner aspect, but nearer to the posterior than the ante- 

 rior border, each hmg is connected to the puhiionarv vessels and bronclii whicli 

 form the main ])art of its root. 



Tlic root of the lung is composed of tiir pulmonary artery and tlie pul- 

 monary veins with the corresponding bronchial tube ; and, in addition, tlic 

 bronchial vessels, tlie l)ranches of the anterior and posterior pulmonary 

 plexuses with .some bronchial lymphatic glands and areolar tissue — the whole 

 being encased in a pleural covering. 



The right root lies bcliind the superior cava and upper jmrtion of the rigiit 



Fio. 544. — PosTERioK View ok tiik Thokax with Chp:st Wall Re.moved, showing the 



LrxGS. (.Motlilied iVom Ijunri'erv. ) 



Supra-spiuatus muscle 



SPINE OF SCAPULA 



Infra-spinatua muscle 



Cut edge ol pleura 



(ESOPHAGUS 

 Cut edge of pleura 



Diaphragm 



auricle of the heart, the anterior pulmonary plexus and the phrenic nerve; above, 

 tlie vena azygos major arches to join the superior cava; behind is the posterior 

 l)uhnonary plexus, the jMieumogastric nerve, and the vena azygos major; whilst 

 below is the ligamentum latum pulmonis. 



The left root has tlie pulmonary i)lcxus and left phrtnic in front; above it is 

 the arch of the aorta; behind, the descending aorta and ]ineunu)gastric nerve with 

 the po.sterior j)ulmonary plexus; whilst below stretches downwards the ligamentum 

 latum pulmonis. 



The chief structures contained within the i-oot vary in ])osition on the two sides. 



From above downwards on th<' right side, they lie as follows — bronchus, 

 artery, and ui)per vein; whil.st on the left side the artery is the highest, the 



