THE HEART AND VASCULAR SYSTEM. 209 



The facial vein commences as the angular at the internal 

 canthus of the eye, where it anastomoses with the ophthalmic 

 vein, and receives the frontal vein. About the angle of the jaw 

 it usually ends in the internal jugular, but sometimes empties 

 into the external jugular or unites with the temporo-maxillary, 

 to enter the external jugular. It receives 



Supraorbital and superior palpebral, Labial, 



Nasal veins, Submental, 



Inferior palpebral, Submaxillary, 



Buccal and masseteric, Palatine. 



The temporal vein is formed by the anterior temporal, which 

 anastomoses with the frontal, and the posterior temporal, which 

 anastomoses with the occipital. It penetrates the parotid gland 

 and forms the temporo-maxillary vein by uniting with the in- 

 ternal maxillary. It receives 



Articular veins, Transverse facial, 



Anterior auricular, Parotid. 



Middle temporal, 



The internal imi.nl.lary vein follows the course of the corre- 

 sponding artery, and receives veins corresponding to the branches 

 of that vessel. Some of these branches form the pterygoid 

 plexus. It passes backward and unites with the temporal vein 

 to form the temporo-maxillary. 



The temporo-maxillary vein, formed by the junction of the 

 internal maxillary in part or whole with the temporal, passes 

 through the parotid gland and receives the posterior auricular, 

 to form the external jugular vein. 



The occipital veins follow the course of the artery, and 

 terminate, usually, in the internal jugular; occasionally, in the 

 external jugular. The mastoid vein, passing through a foramen 

 in the mastoid portion, connects it with the lateral sinus. 



VEINS OP THE TONGUE AND THROAT. The dorsal lingual, 

 formed by branches from the tonsils, epiglottis, and tongue, fol- 

 low the course of the lingual nerve to empty into the facial, either 

 jugular, or the pharyngeal. 



The ranine pursues the course of the hypoglossal nerve, and 

 terminates either in the facial or in one of the jugulars. 



The pharyngeal, commencing in the pharyngeal plexus, re- 

 ceives branches from the brain, and terminates about on a level 

 with the hyoid bone in the internal jugular. 



The superior thyroid conveys the blood from the larynx, 

 trachea, and thyroid gland to the internal jugular. 



VEINS oi' THE UITEK EXTKKMITY. Superficial and deep. 



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