200 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



analogue of the decussating fibres from the antero-lateral columns 

 to the posterior horn, the central vagus-tract. 



Dorsad of the lemniscus we again meet with the posterior 

 longitudinal fasciculus, which was described in the seventh lec- 

 ture. Its fibres are met with deep in the anterior column, as 

 low down as the first cervical nerve. 



Fi. 120. 

 Section through the medulla oblongata. 



Au/steigfnde Vagus etc. If., Ascending vagus, Hint. Neb. Olive, Posterior accessory olivary 



etc , root. process. 



Au/xt. Trii/rm. Wurz., Ascending root of tri- Innere Neli. Olive, Internal accessory olivary 



geminus. process. 



Centr. Ifnub. Bnhn, Central tegmental tract. O/IB. Ztcim-h. Srhirlit, Inter-olivary layer. 



Hint. Llingsb., Fort, longitud. fasciculus. Seit. AYr. li.. Lateral cerebellar tract. 

 Ford. Vag. etc. W., Anterior vagus, etc., root. 



The lower olivary bodies lie on both sides, external to the 

 pyramids. They are traversed by the arciform fibres. Those 

 arciform fibres which come from the cerebellum terminate here, 

 while those originating in the nuclei of the posterior columns 

 are merely in transit. 



Internal to and dorsad of the olivary bodies lie the internal 

 and posterior accessory olivary bodies. These are nuclei whose 



