186 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



of these on each side, the two nuclei of the posterior columns 

 and the olivary body. The greatest difference is in the outer 

 conformation of the section. The fibres of the posterior columns 



Zntisc/ienktrn. 



JfitteUurn. ^ 



v 



' <% 



\ 



." 

 J\f. trochicaris 



Hinierhtrn. 



FIG. 112. 



The hind- and after- brains opened by removing their roof. The velum medullare 

 anticum and the cerebellum can still be seen. The velum medullare posticum lias been 

 removed along the dotted line a 6. 



Binrli'iirm, Peduncle. 

 Sinter him. Hind-brain. 

 Hirnsc/ienkel, Peduno. cerebri. 



Ktrlnhirn, Cerebellum. 

 Mittel/iirn, Mid-brain. 



WHrJiliirn. After-brain. 

 Rtii-krnmiirk, S)i. I'urd. 

 Ziciucheithirn, Inter-brain. 



are pushed gradually forward by the interposed nuclei, so that 

 at last the latter are wholly uncovered and lie almost free on 

 the dorsal surface of the medulla. The posterior columns 



