BULB. CEREBELLUM. 95 



of the grey matter is cut off from the remainder by the decun- 

 sation of the pyramids, and the dorsal cornu are twisted 

 laterally. Two new masses of grey substance, the Gracile and 

 Cuneate nuclei, are seen in the corresponding dorsal columns. 

 On each side of the ventral fissure note the pyramids from 

 which the fibres decussate into the lateral columns. On the 

 dorso-lateral part of the section note the crescentic mass of 

 white substance, the restiform body. The fibres of the twelfth 

 nerve may be seen passing from the ventral cornu and running 

 to the surface on the outer side of the pyramid. 



Bulb. T.S. Man, through the olive, (p. same as the pre- 

 ceding.) The section has a rounded quadrangular outline, the 

 dorsal corners being formed by the restiform bodies, the 

 ventral ones by the olives, which are rendered prominent by 

 the sinuous streak of grey substance which they contain. 

 Between the latter on each side of the ventral fissure are the 

 pyramids. On their free surface note the external arcuate 

 fibres. Dorsally find the floor of the fourth ventricle, against 

 which the grey matter has become applied. It forms two or 

 three small projections ventral wards where the tenth and 

 twelfth cranial nerves have their origin. 



Cerebellum. Man. T.S. Convolutions, (p. the same as the 27 

 last.) "(L) The foliations of the grey matter have a core of white 

 substance (stained dark). The grey substance exhibits two 

 distinct layers the outer, molecular, and the inner, granular. 

 At the junction of the two (H) find Purkinje's cells (not 

 well seen). 



Cerebellum. Cat. T.S. Convolutions, (p. 8, s. 22 & 24, 

 c. P, m. B.) (L) Recognise the granular layer which is 

 brought out prominently by the heemalum stain, (ff) Examine 

 the Purkinje?s cells, the antler-shaped processes of which can 



