64 



THORAX 



glands receive lymph from both lungs. The tracheo-bronchial 

 glands are connected with both the anterior and posterior 

 mediastinal glands by inter-communicating lymph vessels. 

 From the right tracheo-bronchial glands the greater part of 

 the lymph passes through the broncho-mediastinal trunk to 

 the right lymph duct, and so to the right innominate vein, 

 but some is carried to the right inferior deep cervical glands, 

 which lie at the root of the neck behind the sterno-mastoid 

 muscle. The lymph from the left tracheo-bronchial glands 

 flows to the thoracic duct and the left inferior deep cervical 

 glands. The lymph from the inter-tracheo-bronchial glands 



First thoracic 

 vertebra 



Fourth thoracic 

 vertebra 



Superior 

 mediastinum 

 Manubrium sterni 



Liver Middle mediastinum 

 FIG. 26. Diagram of the Mediastina. 



flows partly to the broncho-mediastinal trunk and partly to 

 the thoracic ducts. 



The pulmonary, the broncho-pulmonary, and some of the 

 tracheo-bronchial lymph glands were seen as the root of the 

 lung and the bronchi were dissected. The remaining tracheo- 

 bronchial and the inter-tracheo-bronchial lymph glands 

 cannot be displayed until after the heart has been dissected 

 (seep. 136). 



The Mediastinum and its Contents. It has been pointed 

 out already that the mediastinum is the region which 

 extends from the sternum to the vertebral column between 

 the two pleural sacs ; that it is occupied by some of the 



