MEDULLA OBLONGATA OF AMBLYSTOMA 



419 



Fig. 41 Transverse section at the level of the vagus roots, showing dendrites of 

 two neurones of the nucleus of the fasciculus solitarius, a neurone of the substantia 

 gelatinosa Rolandi immediately ventrally of these, farther ventrally a neurone of 

 the nucleus ambiguus, and still more ventrally two neurones of the motor teg- 

 mentum. Golgi method. X 100. 



Fig. 42 Transverse section at the level of the vagus roots, illustrating two neu- 

 rones of the motor tegmentum. Golgi method. X 100. Sections of this series 

 farther caudad show dendrites of similar neurones extending dorsalward as far as 

 the lateralis X roots, giving off branches to all regions ventrally of this level 

 except the fasciculus solitarius. These are similar to the typical neurones of the 

 motor tegmentum of the spinal cord. The fibers which are here seen entering 

 the tractus bulbo-tectalis are shown by sections farther caudad to arise from 

 the region immediately ventrally of the spinal V root. 



Fig. 43 Transverse section at the level of the vagus roots, illustrating a single 

 neurone of the substantia gelatinosa Rolandi whose dendrites also reach the entire 

 tegmental region. Golgi method. X 100. 



