224 



THE CIRCULATOKY SYSTEM 



[CII. XVIII. 



mesentery, they occur as a connected system of very irregular 

 branched spaces partly occupied by connective-tissue corpuscles, and 



FIG. 236. Lymphatic vessels of the head and neck and the 

 upper part of the trunk (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 medi- 

 astinum. 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 the duct. The termination 

 of the upper lymphatics of the diaphragm in the medias- 

 tinal glands, as well as the cardiac and the deep mammary 

 lymphatics, is also shown. 



FIG. 237. Superficial lymphatics 

 of the forearm and palm of 

 the hand. |. 5. Two small 

 glands at the bend of the 

 arm. 6. Radial lymphatic 

 vessels. 7. Ulnar lymphatic 

 vessels. 8, 8'. Palmar arch 

 of lymphatics. 9, 9'. Outer 

 and inner sets of vessels. 

 b. Cephalic vein. d. Radial 

 vein. e. Median vein. /. Ulnar 

 vein. The lymphatics are re- 

 presented as lying on the 

 deep fascia. (Mascagni.) 



in these and other varieties of connective tissue, the cell spaces com- 

 municate freely with regular lymphatic vessels. In many cases, 



