Chap. XVIIL] CEREBRUM AND CEREBELLUM. 



155 



medulla, this part of the pons i.e., that composed of 

 horizontal fibres increases in thickness. 



204. Of the medulla there is a greater portion 



q 





Fig. 91. Transverse Section through the Lower Corpus Quadrigeininuin 

 and the Pons Varolii. 



a, Aqaeductus sylvii ; b, crossing of the brachia of the lower corp. quadrig. ; <?, 

 ganglion of tlic lower corp. quadrig.; ( t pedunculus of the lower corp. quadrig.; 

 6a, tegmentum ; 5, the descending root of the fifth ; p, bundles of the 

 anterior pyramidal tracts in cross section ; trp, deep transverse bundles 

 of the pons ; trs, superficial transverse bundles of the pous. (Meynert, in 

 Strieker's Manual.) 



continued into the pons than of the cerebellum. 

 (1) There are the pyramidal tracts ; they do not lie on 

 the surface as in the medulla, but are hidden by some 



