QUANTITATIVE STUDY OF THE PURKINJE CELLS 



241 



all the values for the different areas would be somewhat higher 

 than those given there. It has seemed wiser, however, to use 

 the values actually observed rather than to attempt the more or 

 less dangerous expedient of guessing at the extent to which these 

 have fallen below the norm. 



The number of Purkinje cells in equivalent unit areas (EUA) 

 of the two hemispheres of the four normal cerebella is shown in 

 table 1. 



From table 1 it appears that the cells are. closer together in 

 the lobus anterior (area 1) and that they become progressively 

 less numerous in the anteroposterior direction, with the exception 

 that in the lobus biventer, area 6, the number is slightly greater 

 than in area 5. 



In the lobus biventer the cells are usually more numerous 

 in the posterior part. This is not shown in the table because 

 the two parts are considered together; the fact is of importance, 

 however, in relation to some of the changes found in subnormal 

 and senescent cerebella, for in our cases the anterior part of this 

 lobe has suffered the greatest amount of degeneration. 



TABLE 1 



Number of Purkinje cells per EUA in normal cerebella. Areas as in fig.' 1. 

 R = righl hemisphere, L = left hemisphere 



Note. The numeral preceded by =*= equals one-half the average diflfereiice 

 between the right and the left hemispheres. 



