XIII.] THE FEOG. H 



tongue, ■which it enters and then supplies that orga 

 Moreover, it gives off muscular branches and a lar 

 anastomotic branch to the seventh. 



10. The Pneumogastrici or Vagi. 



Immediately after leaving the ganglia these nerv 

 separate from the glossopharyngeal and each gives c 

 a cutaneous branch to the dorsal integument of t' 

 head and trunk : it then divides into two branch( 

 one of which (a) runs on the inner side of and above t' 

 cutaneous branch of the pulmo-cutaneous artery, t] 

 other (h) lies below and diverges from the first. 



a. is the laryngeal nerve. It passes beneath the fii 

 cervical nerve, then crosses over the third aorl 

 arch and, about its middle, turns sharply round 

 to be distributed to the larynx. This ner 

 corresponds with the recurrent laryngeal of tl 

 higher animals. 



h. is the splanchnic branch. It gives off (gastn 

 branches to the gullet and stomach, and a fii 

 nerve (cardiac) which passes beneath the pi 

 monary artery and along the root of the lung 

 the heart, and ends in ganglia situated in tl 

 septum of the auricles. The splanchnic bran( 

 finally enlarges and is distributed to the lun 

 and stomach. 



The myelon or spinal cord is continued back from tl 

 hind-brain as a subcylindrical cord, which lessens somewh 

 rapidly towards its apparent end at the level of the seven 

 vertebra. It does not really end here, however, but is co: 

 tinued back as a slender filament, the filum terminale, to tl 

 commencement of the canal of the urostyle. The diamet 

 of the cord i^ somewhat enlarged opposite the origin of tl 



