120 SURGICAL ANATOMY OF THE THORAX. 



by the left portion of the arch, below by the lesser mus- 

 cle of the diaphragm ; laterally, pleural cavities, root of 

 lungs, and ligamenta lata pulmonum. 



It contains the bifurcation of the trachea and bronchi, 

 vagi, oesophagus, hinder part of root of lung and recur- 

 rent laryngeal nerve of left side, descending aorta, azygos 

 major vein, thoracic duct, and great splanchnic nerves. 



