HEAD AND ANTERIOR CERVICAL STRUCTURES. 35 



external carotid just below its termination ; cut its posterior branches at their origin, and throw the 

 vessel forward. The deep structures can now be exposed. 



Nerve to the posterior belly of the digastric, 809. (790) 

 Xerve to the stylo-hyoid, 809. (790) 

 Stylo-pharyngeus, 987. (965) 



Deep Dissection of the Neck. 



Note the position of the glosso-pharyngeal nerve and its relation to the stylo-pharyngeus muscle. Divide 

 the styloid process at its base and throw it forward and downward with its attached muscles. Expose 

 the upper part of the internal jugular vein ; then divide the vein about two inches below its commence- 

 ment and throw it upward. Carefully expose the internal carotid artery and the nerves in relation 

 with it. Small nerve branches marked ( ) *, can only be demonstrated by a special dissection on a 

 fresh subject and need not be looked for. 



Internal jugular vein ; bulb, 665. (6512) 



Tributaries. 



Internal carotid artery, 5289. (51920) 

 The cervical portion : 

 Relations : Behind. 



Outer side. 

 Inner side. 



Ascending pharyngeal artery, 510-11-12. (502-3) 

 Branches : Prevertebral. 

 Pharyngeal. 

 Palatine. 

 Meningeal. 



Glosso-pharyngeal nerve, 814-15. (7956) 

 " From its superficial origin." 

 (Jugular ganglion.)* 

 (Petrous ganglion.)* 

 Branches: (Meningeal branches.)* 

 (Tympanic branch.)* 



Communicating twigs : 

 (a), (*), (0, (d\ (* 

 (Communicating branches.)* 



See lingual branch, 809. (790) 

 Muscular branch. 

 Pharyngeal branches. 

 Tonsillar branches. 

 Lingual branches. 



The cervical portion of the pneumogastric may now be traced and its branches followed. 



Pneumogastric or vagus nerve, 815-16-17-18. (798-9-800) 

 " From its superficial origin." 

 (Ganglion of the root.)* 

 Ganglion of the trunk : 



Branches: Communicating branches : 



(a), (b\ (0, (</), GO- 

 Branches of distribution : 



(Meningeal or recurrent branch.)* 

 (Auricular branch, or nerve of Arnold.)* 

 Pharyngeal branches. 

 Superior laryngeal nerve : 

 Internal branch. 

 External laryngeal branch. 

 Cardiac branches. 

 Spinal accessory nerve, 820. (801) 



"At the base of the skull." 

 Hypoglossal nerve, 821. (802) 



" The filaments unite to form two fasciculi, etc." 

 Meningeal branch.)* 



