66 



DR. C. F. SONNTAG ON THE VAGUS AND 



The Vagus Nerves. 



The ganglion nodositm is absent in Ailurus fulgens, Ictonyx 

 zorilla, Paradoxicrus larvatus, Melursus iirsinus, Atilax palu- 

 cUnosus and Genettafelina (text-fig. 1 B-G). It is represented by 

 a thin, flat, expanded part of the nerve in Civettictis civetta, 

 Mustela maries, Meles meles, and Mephitis mephitica (text-fig. 2) ; 

 and in other genera it is a well-marked, round, oval, fusiform or 

 pyriform swelling (text-fig. 3). Communications run as usual 

 between it and the other nerves in its vicinity. 



The vagosympathetic cord (text-figs. 1,Y-S.-11, Y-S.) usually 



Text-figure 1. 



C.S. X 



The upper cervical parts of tlie vagus and sympathetic nerves in : A. Nandinia 

 binotata; 'B. Ailurus fulgens; G. Paradoxurtis larvatus; D. Atilax palu- 

 dinosus; E. Melursus ursinus ; F. Genettafelina; G. Ictonyx zorilla; 

 C.S: cervical sympathetic ; X: vagus nerve ; IX: glossopharyngeal nerve ; 

 XI : spinal accessory nerve ; XII : hypoglossal nerve ; G.N : ganglion 

 nodosum ; S.C.G : superior cervical ganglion ; V-S : vago-sympathetic ; 

 C.C.P ; communications to cervical plexus; a: pharyngeal nerve ; h : 

 internal laryngeal nerve ; i.c.n: internal carotid nerve. 



separates again into vagus (V.) and sympathetic (S.) in the 

 posterior third of the neck, but they separate in the anterior 

 part of the thorax in Canis thous (text-fig. 5). I believe the 

 large swelling seen on the nerve in that species is a fusion of the 

 vagus and inferior cervical sympathetic ganglion. It represents 

 a greater degree of fusion than that seen in text-figs. 6 and 7B. 



Pharyngeal Nerve (text-figs. \a, 2a, 3a): — This nerve arises 

 from the ganglion nodosum or from the nerve above it, the latter 



