ORIGIN OF LYMPHATICS. 



355 



arise (3), by communications with connective-tissue cor- 

 puscles (p. 46) ; while the lacteals offer an illustration 

 Fig. 91.* 



* Fig. 91. Lymphatic vessels of the head and neck of the upper 

 part of the trunk (from Mascagni). \. The 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, axilla, and mediastinum. 

 Between the left internal jugular vein and the common carotid artery, 

 the upper ascending part of the thoracic duct marked I, and ahove this, 

 and descending to 2, the arch and last part of the 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. 



