74 

 THE CENTRAL NERVOUS SYSTEM. 



I,ABORATORY WORK FOR THE WEEK. 



References : 

 Points for Quiz : 



Laboratory Report: 



Due : 



Go to the delivery desk for (a) assigned slide 177 ; (A) par- 

 aflBn sections 172, 176 ; (c) sections already stained, 169, 170, 174, 

 175 ; (^) 171 3^nd 173 will be given you during the first period. 



CEREBEI,I-UM. 



Gross Preparations. Examine the gross preparations, noting 

 (a) the parts of the cerebellum — the vermis, lateral hemispheres, 

 and the flocculus, comparing man and the different animals shown ; 

 (iJ) the lobes of the cerebellum and thefotia, their size and direction ; 

 (f) the three peduncles of the cerebellum by which it is connected 

 with the rest of the brain and myel. 



169. Cerebellum. Cat. Sagittal section of the vermis ; 

 vom Rath's fluid ; stained in toto in paracarmine ; collodion ; sec- 

 tions yU. 



Note the deep division into lobes and these into folia. As con- 

 stituting the cerebellum, recognize (a) the central core of alba 

 (fibers) extending into the lobes and folia, {b) the covering cinerea 

 — cortex. Observe the layers of the cortex, the grouping of the 

 cells of the granular layer, the size of the Purkinje cells, the rela- 

 tively small number of cells in the molecular layer. Remember the 

 real extent of the dendrites of the Purkinje cells, the destination of 

 the neurites of the Purkinje cells and granules, and compare 

 with 171. 



170. Cerebellum. . Transection (in part) ; Wei- 

 gert's hematoxylin method ; collodion ; sections ^ ; now in 

 95% alcohol. Clear and mount in alkaline balsam. 



This preparation will illustrate the ento-cinerea of the cerebel- 

 lum — the nucleus dentatus and the nuclei of the roof, as well as the 



