CERVICAL LYMPHATIC VESSELS AND GLANDS. 517 



cervical glands. From these glands efferent vessels issue, which pro- 

 gressively diminish in number during their descent, and unite into two 



Fis. 327. 



Fig. 327. —Principal Lymphatic Vessels and Glands of the Head and Neck 

 ON the KiOHT Side (after Bourgery in part). ^ 



The inner half of the right clancle and part of the sternum have been removed so as 

 to expose the arch of the aorta, and the innominate artery and veins • the posterior beUy 

 of the omo-hyoid muscle is lemoved ; and the sterno-mastoid, sterno-hyoid, and sterno- 

 thyroid muscles, and a part of the external jugular vein have been divided so as to expose 

 the deeper parts. 



a, the right innominate vein at the place where it is joined by the principal lymphatic 

 trunk ; a, the left vein ; h, arch of the aorta ; c, common carotid artery ; d, thyroid 

 gland crossed by the anterior jugular vein ; e, cut surface of the sternum ; /, outer part 

 of the clavicle ; 1, submaxillary lymphatic vessels ; 1', sublingual ; 2, temporal, facial 

 and parotid ; 3, occipital and posterior auricular ; 4, deep or descending cervical close 

 to the great vessels ; 5, transverse cervical ; 6, deep pectoral and axillary ; 7, on the 

 vena cava superior, some of the right mediastinal ; 8, on the innominate artery, some of 

 the deeper cardiac and bronchial ; to these last ai-e seen descending some of the lym- 

 phatics from the thjToid gland and lower part of the neck. 



trunks, of which the left one ends in the thoracic duct, and the other in 

 the right lymphatic duct : sometimes, however, the main cervical 

 lymphatic vessel terminates separately at the junction of the subclav'an 

 and internal jugular veins, or in one of those veins immediately before 

 their union. 



The lymphatics of the cranitini consist of a temporal and an 

 occipital .set. Those of the temporal set descend in front of the ear, 



