TllK CRANIAL XEI{\KS. 173 



Glossopliaiyng'eal of the A'ag-iis^ Miiller), (Fig's. 102 and 103 A', iii, 

 113, 114, and 115 X^) arises in common with the pneumogastric 

 nerve, and quits the skull with it throug-h an opening (Canali-s nervl 

 vagi) immediately behind the auditory capsule, and at once divides 

 into two branches ; both of which lie under the 3I3I. intertran^- 

 versarii capitis and are covered by the Dejiressor mandihulae. 



a. The liamiis anterior (Verbindungsast des Glossopharyngeus, 

 Wiedersheim j Uamus co)iimunicans, Hoffmann; Uniting Branch, 

 Wyman ; Laryng'eal Branch of the Vagus, Volkmann ; Conniinni- 

 cans ad faeialeni , de Watteville), (Figs. 111, 113, and 114 X^). This 

 nerve curves downwards and forwards around the auditory capsule 

 and beneath the Dejjremor manditjuli to join the facial nerve, as 

 already described. 



b. The Bamus poderior {N. glossophariingeiis, Wiedersheim ; 

 Bamm UngnaUs, Hoffmann), (Figs. 11 1, 113, and 1 14 X-). This 

 nerve rmis downwards and forwards to the ventral surface of the 

 pharynx, dips underneath the Betrohyoideus IT , to ajij^ear again, 

 after a short interval, by piercing the BcfroJn/oideiis II or ///, 

 courses parallel to and behind the anterior cornu of the hyoid bone, 

 and thus reaches the floor of the mouth. The nerve then runs 

 forwards in a very sinvious course, close to the median line, and 

 between the Geniohyoid eus and Ilyoglossvs ; in its course on the 

 floor of the mouth it crosses the hypog-lossal nerve. It sujjplies 

 the petrohyoid muscles, and gives numeroiTS small branches to the 

 mucous membrane of the pharynx (^Baiiivs pliaryngeiis, Hoffmann). 



10. The pneumogastric or vagus nerve ( Vagus; Bamus intestinalis 

 nervi vagi, Fischer, Hoffmann ; A'agal Trunk, Wyman ; Vaso- 

 sympathetic, Gaskell), (Figs, r 1 1, 113, 114, and 115 X^). This 

 nerve arises in common with the glossopharyngeal ; the two nerves 

 leave the skull together by an opening in the exoccijjital bone 

 [Canalis nervi vagi) ; immediately outside the skull they acquire a 

 ganglionic enlarg-ement [Ganglion condyloideum, Ganglion nervi vagi), 

 (Fig. Ill XG) ; in this course the glossopharyngeal lies in front of 

 the pneumogastric, which it then leaves. The pneumogastric lies 

 first upon the M. levator anguli scapulae, then running backwards 

 and downwards along the hinder border of the Betrohyoideus IF 

 it comes to the side of the pharynx ; it is covered by the trapezius, 

 and passes between the hypoglossal nerve and the Aorta ascendens ; 

 arriving at the Arteria pulmonalis, it gives off its terminal branches. 



