183 



vagus breiten sich niedriger, näher zum Tractus spinalis trigeraini aus. 

 Ueber der Endigung des N. vagi liegen die Fasern der dorsalen 

 Wurzeln der spinalen und der spino-occipitalen Nerven mit den ab- 

 steigenden Fasern des N. lateralis posterior." This position would 

 answer very well for the fibers of the vagus which are distributed to 

 the skin, viz. the cutaneous component, but the visceral sensory com- 

 ponent has its center just in the medio-dorsal column to which Tret- 

 JAKOFF would deny the name lobus vagi. Tretjakoff's figure 32 shows 

 that the vagal and glossopharyngeal roots were very lightly impregnated 

 in his Cajal preparations and he states that they were not stained at 

 all in methylene blue. 



In describing the N. facialis the author has not taken into account 

 the cutaneous component described by me (1905). He describes the 

 lateralis roots and says: "Im Unterschied von der Beschreibung der 

 erwähnten Forscher bleibt nach meinen Beobachtungen das Bündel 

 sensibler Fasern des N. facialis bis zu Ende kompakt und hat gar 

 keine Beziehungen zu dem Lobus vagi; die ihm zugehörige Gruppe 

 der Schaltzellen liegt unterhalb der Mitte des Tuberculum acusticum, 

 nach vorn vom Kern des N, lateralis posterior" (p. 671). He also 

 says: "Das Faserbündel des N. facialis, welches der medialen Kante 

 des Tract, spin, trigem. anliegt und von Johnston als etwas Neues 

 beschrieben wird, gehört meiner Meinung nach eher dem N. glosso- 

 pharyngeus an." These statements show clearly that the author has 

 not seen the communis root of the N. facialis and it is almost equally 

 sure that he has not seen the visceral sensory fibers of the Nn. glosso- 

 pharyngeus and vagus. This is supported by the statement: "Meiner 

 Meinung nach können die Bahnen im Gebiet des Tuberculum acusticum 

 von Ammocoetes einfach und leicht auf das Schema der Bahnen der 

 Nn, glossopharyngeus und vagus zurückgeführt werden" (p. 667). The 

 several differences between the visceral sensory and somatic sensory fibers 

 mentioned above are so clear and striking that the author could never 

 have confused them if he had both kinds of fibers in view. He has 

 studied only the cutaneous, lateralis and acusticus fibers and it is of 

 course true that these components are arranged in the same way in 

 the acustico - facial group as in the vago - glossopharyngeal group of 

 nerves. 



The disposition of the visceral sensory fibers of the Nn, vagus 

 and glossopharyngeus as they enter the brain and their endings in the 

 "lobus vagi" and in the nucleus commissuralis have been described in 

 my earlier paper (1902, p. 24 and Figs. 8 and 9), The visceral sen- 

 sory fibers of the N. facialis are drawn in Fig. 11, /".c. I have also 



