600 



A. Facts. 



1. The sensory Vth., Vlllth., and lateral line nerves enter common 

 centers, namely, the Nucleus funiculi, tuberculum acusticum, and the 

 granular layer of the cerebellum. 



2. A large part of the Vth., Vlllth., and lateral line fibres go as 

 arcuate fibres to the opposite side. 



3. The Lobus trigemini of Goronowitsch is shown by its structure 

 to be a part of the tuberculum acusticum. 



4. There is continuity of structure between the acusticum and 

 the granular layer of the cerebellum. In fact, the acusticum with 

 the cerebellar crest corresponds in every detail with the cere- 

 bellum, and the one may be considered as the direct continuation of 

 the other. 



5. A large bundle of fibres (chiefly from the lateral line nerve?) 

 runs from the tuberculum acusticum to the Nucleus funiculi and to a 

 special Nucleus acustici spinalis. 



6. The cells of the tuberculum acusticum send their dendrites to 

 the base of the medulla. 



7. There is a secondary tract from the acusticum which joins the 

 spinal Vth. 



8. The sensory Vllth., IXth., and Xth. nerves (exclusive of 

 lateral line and spinal Vth. constituents) enter a common center, the 

 Lobus vagi. 



9. The secondary vagus tract divides into ascending and de- 

 scending bundles. The ascending bundle ends in the Rindenknoten as 

 described by others. The descending bundle extends into the cord. 



10. Cells of the II type are found in the Lobus vagi, the acusti- 

 cum, and in both layers of the cerebellum, 



11. A remarkable cell of the II type found in the valvula has 

 dendrites similar to those of the Purkinje cells and a very coarse 

 neurite with peculiar club- like thickenings. 



12. Meynert's bundles have two sets of fibres, one of which after 

 decussating ends in a nucleus dorsal to the ansiform commissure and 

 bordering on the central cavity at the posterior end of the base of 

 the raid -brain. The other, composed of fine fibres, probably ends, 

 after partial decussation, in the granular layer of the cerebellum. 



13. The Corpus interpedunculare is probably a nucleus of secondary 

 importance in connection with the bundles of Meynert. 



B. Theoretical conclusions. 



14. The structure of the sensory nerve centers in the medulla 

 indicates that the cranial sensory nerves are arranged in two quite 



