Cranial Nerves. 139 



GANGL. JLGUL: 



GANG-L. PETR05. 



N. JACOBSONII 



R. SYMPATH. 



IX. N. GL05SO- 

 PHARYNG. 



R. AURICUL. 



N. PHARYNG. 

 SUP. ET INF. 



LARYNG. SUP. 



X. N. VAGUS 



483. Diagram of the Origin of the Ninth, Tenth, 

 Eleventh and Twelfth Pairs of Cranial Nerves. 



The tenth pair of cranial nerves are the two p n e u m o- 

 gastric nerves, Nervi vagi. Arising from the Medulla oblongata, the 

 vagus passes out of the cranium through the jugular foramen, in com- 

 pany with the glosso-pharyngeal and spinal accessory nerves. 



1. The cervical portion presents in the jugular foramen the 

 Ganglion jugulare, or ganglion ofthe root ofthe pneumogastric, 

 which is connected with the first cervical ganglion, Ganglion 

 ccrvic. primum (superius) of the sympathetic nerve; below the jugular 

 ganglion the Vagus communicates freely with neighbouring nerves, and 

 thereby the lower ganglion or ganglion of the trunk or 

 Plexus nodosus about */ z inch in length, is formed ; then the nerve 

 descends between the common carotid artery and internal jugular vein, 

 into and through the thorax. Its branches are : 



a) A u r i c u 1 a r b r a n c h, Bamus auricularis vagi, A r n o 1 d's nerve, 

 which arises from the jugular ganglion; it receives a branch from the 

 petrous ganglion of the glosso-pharyngeal nerve, passes outwards behind 

 the jugular vein, reaches the Aquaeductus Fallopii, crosses the facial nerve, 

 with which it is connected by two filaments, and passes through the 

 CanaUculm mastoideus behind the pinna, where it partially communicates 

 with the deep auricular branch of the facial nerve, partly supplies the 

 posterior wall of the external auditory meatus. 



Heitzmann, Atlas. II. 19 



