(J70 



miL'leiis XI in tlie giraffe, a commissural motor vagus nucleus 

 occurs wliicii is not continued. 



5. In tlie first cervical segmeiit it is repeatedly observable that 

 medial and central anterior horn cells of small type rise upwards like 

 an arch to above the central canal at exactly the place where 

 frontally from the nucleus mot. X doz'salis will appear ; in the 

 most spinal portion of tlie vagus nucleus numbers of vagus cells 

 leave the connection for a more \entral level, and in a lai-ge portion 

 of the hypoglossus region this is so often tlie case that the vagus 

 and tongue nuclei are completely joined. 



(j. The ambiguus is strongly developed in a large part of that 

 portion of the nucleus which lies in the closed portion of the oblon- 

 gata, and occurs here often in forms which are not to be met with 

 in other animals; the frontal growth of the ambiguus is very strongly 

 developed and reaches the facialis region, somewhat cranially from 

 the frontal pole of nucleus X dorsalis. 



7. In the giraffe the simultaneous presence of nucl. mot. dorsalis 

 vagi, nucleus access., and nucleus ambiguus is repeatedly to be 

 met with. 



8. In the spinal end of the oblongata the main group of the 

 iHicleus accessorii in the giraffe lies on the border of anterior and 

 posterior horns ; this nucleus, however, repeatedly radiates both in 

 a medial and in a lateral direction. In the latter case the nucleus 

 frequently consists of 2 groups, the medial one being at the usual 

 place between the anterior and posterior horns, while the lateral one 

 lies in the substantia reticularis. Spinally from 'this we see the direct 

 connection of the nucleus with the cells lying on the latero-dorsal 

 border of the frontal horn, and further spinally the nucleus does not 

 occur again on the border of the anterior and posterior horns ; behind 

 the first cervical segment thus it shifts in a latero-ventral direction. 



9. The tongue nucleus in the giraffe is, in comparison with the 

 vagus nucleus, short but unusually strongly developed ; frontal from 

 the com<missural motor vagus nucleus a commissural tongue nucleus 

 occurs, which like the one mentioned above, is not continuous, but 

 ends close to the calamus. In the same region the tongue nucleus 

 has an irregular quadrilateral shape, more frontally it splits into 

 a dorsal and a ventral portion. 



10. The oliva inferior is strongly developed ; there is a small 

 connecting olive ; the nucleus reticularis inferior is poorly developed. 



