COURSE OF THE LYMPHATICS. 



279 



the thoracic duct, which finally empties its contents into the 

 blood-stream at the junction of the internal jugular and sub- 

 clavian veins of the left side. There is a smaller duct on the 

 right side. The lymphatic vessels of the intestinal canal are 

 called lacteals, because, during digestion, the fluid contained 

 in them resembles milk in appearance ; and the lymph in the 

 lacteals during the period of digestion is called chyle. There 



FIG. 93. 



Lymphatic vessels of the head and neck of the upper part of the trunk (from Mas- 

 oagni) l r T ne chest and pericardium have been opened on the left side, and the 

 left mamma detached and thrown outwards over the left arm, so as to expose a great 

 part of its deep surface. The principal lymphatic vessels and glands are shown on 

 the side of the head and face, and in the neck, axiila, and mediastinum. Between 

 the left internal jugular vein and the common carotid artery, the upper ascending 

 part of the thoracic duct marked 1, and above this, and descending to 2, the arch 

 and last part of tin- duct. The termination of the upper lymphatics of the diaphragm 

 in the mediastinal glands as well as the cardiac and the deep mammary lymphatics, 

 are also shown. 



