212 



HEAD AND NECK 



will be noted also that three nerves and three arteries cross the 

 vessel superficially, viz. : 



1. The hypoglossal nerve. 



2. The glosso-pharyngeal nerve. 



3. The pharyngeal branch of the 



vagus nerve. 



Accessory 



Descendens hypoglossi 



Ascending pharyngeal 

 Internal carotid 



1. The occipital artery. 



2. The sterno-mastoid branch of 



the occipital artery. 



3. The posterior auricular artery. 



losso-pharyngeal 

 ficial temporal 



lal maxillary 



External 

 carotid 



Posterior 

 auricular 



Occipital 



Branch 

 hyreo-hyoid 



Common carotid 



FlG. 77. Diagram of Carotid System of Vessels in the Neck, with the 

 Glosso-pharyngeal, Vagus, Accessory, and Hypoglossal Nerves. 



The hypoglossal nerve, as already noted, crosses it in the 

 carotid triangle ; the other nerves cross it under cover of the 

 posterior belly of the digastric. The occipital artery crosses 



