74 A MANUAL OF ANATOMY. 



The posterior branch is joined by the posterior auricular 

 vein, and the trunk thus formed is the external jugular 

 vein. 



The external jugular descends vertically, crosses the 

 sternomastoid (obliquely), pierces the deep cervical fascia 

 behind the middle of the clavicle, and empties into the 

 subclavian vein. 



In its course it receives from the rear the posterior exter- 

 nal jugular, the superficial transverse cervical, the supra- 

 scapular ; from the front, a communicating vein from the 

 facial, internal, and (sometimes) anterior jugular veins. 



The Posterior External Jugular. This vein drains the 

 blood from the upper and back part of the neck. It opens 

 into the external jugular at the posterior margin of the 

 sternomastoid muscle. 



The Anterior Jugular. This is formed under the chin 

 close to the median line by the union of several small veins. 

 Its course is downward until near the sternal end of the 

 clavicle, when it pierces the deep fascia, turns outward 

 under the sternomastoid, and empties into the external 

 jugular close to its termination, or into the subclavian vein. 



It is connected by branches, varying in size, with the 

 facial, external, and opposite anterior jugular veins. 



The Facial Vein in the Neck. Just below the neck 

 this vein is joined by the anterior division of the temporo- 

 maxillary sinus ; it gives off the anastomotic vein to the 

 anterior jugular, and then empties into the internal jugular 

 at the level of the hyoid bone. 



The Superficial Nerves. Fig. 16. Diag. 6. 



These are as follows : 



The inframaxillary branch from the cervicofacial divi- 

 sion of the seventh ; which passes downward and forward 



