branx'hes of the jugular vein. 447 



'internal maxillary vein. 



This, the other radical of the jugular, is a large vessel situated 

 between the pterygoid muscles and the maxillary bone ; it runs 

 obliquely upwards a.nd backwards, to the inner aspect of the maxil- 

 lary articulation, just below the condyle of the lower jaw, where, 

 after turning slightly downwards, it joins the superficial temporal ; 

 it originates in the buccal vein, near the superior extremity of the 

 buccinator. Its bi'anches are the lingual, the inferior dental, 

 deep temporals, pterygoids, and other satellites of the branches of 

 the internal maxillary artery. 



The arrangement of the buccal vein is worthy of note. It 

 proceeds from the facial vein at the anterior edge of the masseter 

 muscle, and passes upwards and backwards under that muscle, 

 presenting an enormous dilatation or pouch. Towards the superior 

 end of the buccinator it becomes the internal maxillary vein. 



BRANCHES OF THE JUGULAR VEIN. 



(Fig. 16S.) 



The chief" branches entering the jugular are the maxillo- 

 muscular, posterior auricular, occipital, glosso-facial, thyroid, and 

 cephalic. The maxillo-Tnuscular veins are two in number, and 

 correspond to the branches of the arter3^ The i^osterior auricular, 

 which commences under the ear, descends over the parotid gland, 

 where it receives numerous branches, and enters the jugular just 

 below, and on the opposite side of the preceding. The occipital 

 vein, the satellite of the artery, receives blood from the brain, 

 spinal cord, and muscles about the poll. 



The glosso-facial, external or submaxillary vein, also a satellite, 

 commences by two branches : the posterior or angular comes from 

 the angle of the eye ; the anterior or clorsalis nasi, from the upper 

 part of the nose. It descends along the anterior border of 

 masseter, and winds round the lower jaw, between the artery and 

 Steno's duct. Below the pterygoideus, at the antero-inferior 

 border of the submaxillary gland, it leaves the artery, and enters 

 the jugular at an acute angle. The chief branches of the glosso- 

 facial, in addition to a small lateral nasal vein near its origin, 

 are the alveolar, superior and inferior coronary, buccal, and sub- 

 lingual veins. 



The alveolar vein, or vena varicosa, is peculiar in form and 

 disposition, being buried under the masseter, between the zygoma 



