THE PONS VAROLII. 



289 



basalis, is largely occupied by the bulky pyramidal tracts, which are now 

 excluded from the surface by a conspicuous layer of superficial transverse 

 fibres, the stratum siiperficiale pontis, that laterally sweeps backwards into 



Abducent fibres 



Superior cerebellar _ 



peduncle 

 Facial fibres _ 



Substantia gelatinosa 



Spinal root of V 



Facial nucleus 



Trapezoidal fibres 



Superior olive 



Pyramidal 



Superior cerebellar peduncle 

 Nucleus Post, long Nucleus 

 |L\-'\ of VI fasciculus of VI 



'Facial fibers 

 Vestibular fibre* 



ransverse fibres 



into ventral and dorsal areas. 



FIG. 336. Section across pons at level C, Fig. 329, showing subdivision i 

 X 3. (Preparation by Professor Spiller.) 



the cerebellar peduncles. The pyramids, however, no longer appear as 

 compact fields, as in the medulla, but are broken up into smaller bundles by 

 the transverse strands of the ponto-cerebellar fibres. This subdivision is 





FIG. 337. Portion of ventral area of pons, showing cells of pontile nucleus. X 300. 



more marked at higher levels of the pons, where the interweaving of the 

 longitudinal and transverse bundles produces a coarse feltwork, the stratum 

 complexum. At the upper border of the pons, the scattered pyramidal 



