XXXII] THE SPINAL BULB 257 



of nucleus 8 v., numerous small bundles of fibres with scattered, 

 rather large nerve cells the inner division of the restiform 

 body containing the descending root of the vestibular division 

 of the 8th nerve (bundle formation). 



The bundle of fibres on the lateral surface of the restiforrn 

 body fibres of 8 c. In this bundle in the ventral part of 

 its course an oval mass of oval cells, the accessory nucleus 

 of 8 c., and in its further course chiefly on its outer surface 

 deeply stained grey matter with small nerve cells the lateral 

 nucleus of 8 c. 



Dog. Section just below the trapezium. There is no lower olive. 

 The 12th, the 9th and 10th nuclei will probably be absent. The 

 accessory nucleus is more on the medial side of 8 c. Medially and 

 dorsally of the bulbar 5th is a large group of large cells the nucleus 

 of the 1th ; from this fibres will be seen to run dorsally and a little 

 medially. The anterior column tract is separated from the fillet by 

 diffuse grey substance, the fillet is the layer immediately dorsal to 

 the projection formed by the pyramid, the boundaries of the two are 

 not distinguishable. 



7. Section through the lower edge of the pons and upper 

 extremity of the lower olive. 



Note : 



The superficial fibres of the pons (middle peduncle of 

 cerebellum) running ventrally to the pyramids, and between 

 these fibres, grey substance with numerous nerve cells the 

 nucleus of the pons. 



The lower olive, probably not open towards the raphe. 



The nucleus of 8 v. stretching nearly to the middle line ; 

 laterally continuous with a little grey substance stretching over 

 the restiform body ; on the dorsal surface there may be a band 

 of fibres (stria acustica). The accessory nucleus of 8 c. ventro- 

 laterally of the restiform body, its size varies much in different 

 sections in this region; it may be completely covered by the 

 white substance of the cerebellum : large bundles of the 8th 

 nerve may be seen medially and ventrally of the accessory 



L. 17 



