446 ANGIOLOGY. 



tion, being the continuation of the humeral ; in company with 

 the artery, it winds round the first rib, below the lower insertion 

 of the scalenus muscle, enters the thorax, uniting with its fellow 

 and the jugular confluent to form the anterior vena cava. 



JUGULAR VEIN. 

 (Fig. 168. 2, 4.) 



The jugular vein, the great vein of the head, and satellite of 

 the carotid, commences by two branches, the superficial temporal 

 and internal maxillary, just behind and below the temporo- 

 raaxillary articulation, its origin thus corresponding to the break- 

 ing up of the external carotid artery. Lodged at first in the 

 posterior part of the parotid gland, in the neck it is superficially 

 placed, occupying the jugular gutter, a canal formed by the 

 levator humeri and sterno-maxillaris muscles ; it enters the 

 thorax, joining its fellow, between the first ribs, and under the 

 trachea, to form the jugular confluent, into which the brachial 

 veins discharge, the whole forming the anterior cava. The veins 

 joining the jugular correspond for the most part to their respect- 

 ive arteries. 



SUPERFICIAL TEMPORAL VEIN. 

 (Fig. 168. i.) 



The superficial temporal, one of the radicals of the jugular' 

 vein, and a satellite of the corresponding artery, is situated 

 behind the posterior border of the jaw, near the temporo- 

 maxillary articulation, and buried in and under the parotid 

 gland. It results from the union of the anterior auricular and 

 subzygomatic veins. The large anterior auricular receives the 

 superior cerebral vein, which leaves the cranium by the parieto- 

 temporal conduit, just behind the articulation of the lower jaw. 

 The superficial temporal vein passes through the temporalis muscle, 

 receiving branches from it and from the external part of the 

 ear. 



The subzygomatic vein is divided into two branches, the trans- 

 verse, a satellite of the equivalent artery, and the masseter, which 

 anastomoses with the maxillo-muscular inferiorly, and with a large 

 vein from the temporalis which comes through the sigmoid notch, 

 and receives the deep temporal branches of the internal maxillary 

 vein superiorly. 



