648 



the scliemata, traced from niiorophotos made in tlie ahove-mentioned 

 Instilute. 



The dorsal motor vagus nucleus. In no other manmial I have 

 ever examined, does such a large i)art of tliis nucleus lie in the 

 closed portion of the oblongata. In the hdrse, the ox and the sheep 

 Vj of this nucleus lie spinally from the calamus, in the pig and 

 the dog it is nearly equally divided between the closed and the 

 open parts of the oblongata, in the goat, the lama and the camel 

 7s, and in the giraffe no less than c.c. 7^ are situated spinally from 

 the calamus (series of 1295 sections, 1007 of which spinal and 278 

 frontal from the calamus) (fig. 1). It makes its appearance with a 

 few cells at the usual place, dorso-laterally from the canalis centralis. 

 Some scores of sections frontally it is still poorly developed, and not 

 unfrequently is entirely absent. In spite of its defective development, 

 its appearance in this region varies. Sometimes a few cells are seen, 

 clustered in a small group, while again we see a greater number, 

 several of which have shifted into a more ventral level, or we see 

 a narrow row of cells running horizontally and spreading laterally. 

 Where in these last cases the cells, which in former sections lay 



Calamus 



-<- 



Frontal 



Spinal 



Fig. 1. Dorsal motor vagus nucleus of Giraffe. 



a. Separate cell-group at the frontal pole. 

 h. Separate cell-groupe at the spinal pole, 

 c. Increases by fusion with nucleus XI. 

 00 nucleus motorius commissuralis vagi. 



