LESSON XXXIV. 



THE CEREBRUM AND CEREBELLUM. 



1. Section of cerebral hemisphere of rabbit (am- 

 monium bichromate 2 p.c. ; picrocarmine), mount in 

 balsam. Observe 



a. The inner layer of horizontal nerve fibres (medul- 

 lated) forming the white substance ; (between the fibres 

 a considerable number of leucocytes will be seen ; ) from 

 this bundles of fibres at fairly regular intervals run out 

 into the grey substance, usually ceasing to be distinct 

 in the third layer. 



b. At the outer limit of (a) a layer of fusiform nerve 

 cells lying amongst nerve fibres and forming the 5th 

 layer of the grey substance of the cortex. 



c. Outside this, a layer of small cells of various 

 shapes, cells with three or more obvious though small 

 processes predominating (angular cells) ; these form the 

 4th layer of the cortex. 



d. Outside (c) are large pyramidal cells, the process 

 from the apex of the cell tapering off from it and often 

 being traceable upwards for a considerable distance; 

 from the base three, four, or more processes may be seen 

 to proceed. The district of the large pyramidal cells 

 forms the 3rd layer of the cortex ; it will be seen that it 

 is much thicker than any of the rest, and that generally 



