THE LUNGS 



1195 



backward to the hilum. The middle lobe (lobus medius), the smallest of the lobes 

 of the right lung, lies between the horizontal fissure and the lower part of the oblique 

 fissure; it is wedge-shaped and includes the lower part of the anterior border and 

 the anterior part of the base of the lung. 



Subclavian 

 artery. 





FIG. 910. Lateral view of chest, showing relations of right pleura and lung to the ch 

 indicates the line of pleural reflection; the red lines, the outline of the lung a 



wall. The blue line 



ig and its fissures. 



The right lung is the larp-erand Jieayier: it is broader than the left, owing to 



<P jQ ^MMM^Bi^^ l *^^^"" 1 "* 11 ^^^^^^ ^ 



the inclination of the heart to the left side; it is also shorter by an inch, in 

 consequence of the Diaphragm rising higher on the right side to accommodate 

 the liver. 



The Root of the Lung (radix pulmonis) (Figs. 903 and 904). A little above the 

 middle of the inner surface of each lung, and nearer its posterior than its anterior 

 border, is its root, by which the lung is connected to the heart and the trachea. 

 The root is formed by the bronchial tube, the pulmonary artery, the pulmonary 

 veins, (lie bronchial arteries and veins, the pulmonary plexus of nerves, lymphatics, 

 bronchial lymph nodes, and areolar tissue, all of which are enclosed by a reflection 

 of the pleura. "The root of the right lung lies behind the superior vena cava and 

 ascending portion of the aorta, and below the vena azygos major. The root of 

 the left lung passes beneath the arch of the aorta and in front of the descending 

 aorta; the phrenic nerve "and the anterior pulmonary plexus lie in front of each, 

 and the vagus and posterior pulmonary plexus behind each; below each is the 

 ligamentum latum pulmonis. 



