The Vascular System 211 



In the forearm the brachial may be called the 

 radial, Fig. 60, A, ra; on the back of the manus the 

 radial receives branches from the various digits 

 and from a rather complex plexus of vessels in the 

 carpal region. 



The external jugular, Fig. 60, ej, after separating 

 from the subclavian, may be traced cephalad, close 

 beneath the skin, to the base of the skull, where 

 it is connected with the internal jugular by short 

 branches, as has already been noted. It receives 

 several small branches from the skin and muscles 

 of the neck and shoulder regions. At the region 

 of its anastomosis with the internal jugular 

 it receives a large branch, the muscular, ms, from 

 the massive muscle at the angle of the jaw and from 

 the skin of that region. 



A short distance cephalad to the muscular the 

 external jugular receives, on its mesial side, two 

 or three branches from the trachea, larynx, and 

 oesophagus, tr. Anterior to these vessels the 

 external jugular is formed by the union of two 

 chief veins, the lingual, 1, from the ventro-lateral 

 surface of the tongue, and the inferior dental, id, 

 from the mesial surface of the lower jaw. The 

 connection of the superior dental (extending along 

 the bases of the maxillary teeth) with the jug- 

 ular could not be determined with certainty, 

 hence that vessel is not shown in the figure. The 

 same is true of the small veins in the region of the 

 cranium. 



