THE CHANIAL NERVES. 79 



the dorsal side of the pneumogastric, and is attached 

 to it at that point. Beyond this follow it till it enters 

 its foramen in the occipital bone (25, b). 



199. Follow the sympathetic trunk along the upper 

 half of the neck. Near the skull it separates from the 

 pneumogastric, and lies to its outer side ; crossing 

 ventrally to the hypoglossal, it divides into an inner and 

 outer branch. The former enters the ganglion (197); 

 the latter proceeds alongside the carotid, and disappears 

 through a foramen in the base of the skull (26, /) placed 

 just internal to that through which the carotid disap- 

 pears. 



200. A short way anterior and external to the supe- 

 rior cervical ganglion, the seventh nerve will be found 

 passing out from its foramen immediately in front of 

 the opening of the carotid canal ; it then runs to the 

 proximal end of the anterior cornu of the hyoid. In 

 its course it presents a small ganglion, from which two 

 branches proceed ; one is that already seen curling 

 around the hyoid cornu to enter the digastric muscle 

 (194, c) ; the other is distributed along the posterior 

 border of the mandible. 



201. Trace the glosso-pharyngeal nerve (194, b) to- 

 ward the skull ; it will be found to enter the superior 

 cervical ganglion. 



202. Two small branches in this region still remain 

 for description : one runs back from the superior cer- 

 vical ganglion to the gullet, and is probably to be 

 regarded as an (esophageal branch of the pneumogastric ; 



