MEDULLA OBLONGATA OF AMBLYSTOMA 



411 



30 



Fig. 28 Transverse section immediately in front of the VII roots, illustrating a 

 partial impregnation of three neurones of the area acustico-lateralis. Each of the 

 two dorsal neurones is related with the lateralis roots from both the VII and X 

 nerves; the ventral neurone reaches also the VIII and V roots. The section is 

 oblique, the right and dorsal sides being farther caudad. Golgi method. X 100. 



Fig. 29 Transverse section immediately in front of the lateralis VII roots. 

 The preparation shows one large tangential neurone of the marginal zone of the 

 gray substance, whose ventral dendrites reach the tegmentum and spinal V root 

 and whose dorsal dendrites (not shown in the preparation) probably spread through- 

 out the area acustico-lateralis. The dendrites of two other neurones are impreg- 

 nated, one of the substantia gelatinosa Rolandi and one of the motor tegmentum. 

 The latter arborizes chiefly in the tractus tecto-bulbaris of the same and the 

 opposite side. Golgi method. X 100. 



Fig. 30 Transverse section at the level of the lateralis VII roots. One neurone 

 of the motor tegmentum is impregnated and farther laterally a typical ependymal 

 element. Golgi method. X 100. 



