78 "Journal of Comparative Neurology and Psychology. 



and perhaps for the glossopharyngeus and vagus also) upon leav- 

 ing the cerebellum take a longitudinal course and run backward 

 through the static field. 



Probably we must reckon among these also the direct cerebellar 

 connections of the octavus which ha% e been so well demonstrated 

 in Scyllium by Edinger, so that this tr. cerebello-spinalis dorsalis 

 must be considered as Haller's indirect cerebellum tract as well 

 as the direct continuation of the funiculi posteriores of the spinal 

 cord mentioned by Banchi, for which, however, no sure proof 

 could be obtained. 



Before passing to the static center I must first treat of the nerviis 

 abdiuens and facialis. The abducens is treated of here in order 

 to follow the sequence of the official numbers, in spite of the fact 

 that it leaves the brain behind the nervus facialis and acusticus. 

 This eye-muscle nerve receives its fibers from a nucleus situated 

 more ventrally than the motor trigemino-facialis cell column. 

 This ventral situation of the nucleus, so different from that of 

 higher vertebrates, has already been noted by Mayser and also 

 bv Haller. a similar elevation in higher vertebrates has also 

 been asserted by Koch for a part of the hypoglossus nucleus. 

 That the abducens nucleus receives tecto-spinal fibers has already 

 been mentioned. A part of the root fibers of the sixth nerve cross 

 in the most ventral part of the fasciculus longitudinalis dorsalis. 



As it leaves the oblongata the nervus facialis contains fibers 

 which come from two different regions of which only the motor 

 fibers are really genuine facialis fibers; i. e., these are the only ones 

 which originate from a separate region which can be considered 

 as a facialis region, for the sensory fibers originate farther back 

 from the glossopharyngeus region. The motor facialis fibers 

 arise from large motor cells situated somewhat caudad of the 

 origin of the facialis from the oblongata and for the most part in 

 the backward continuation of the cell column which I have already 

 described in connection with the origin of the motor trigeminus. 

 The motor facialis cells may be divided into two groups which, 

 however, are not sharply separated but gradually merge into each 

 other. 



The most dorsal group is situated laterally to the fasc. long, 

 posterior, as has been correctly described by Van Gehuchten. 

 The fibers of this group first rise up for a short distance and then, 

 after a partial decussation in the upper half of the raphe, take 



