CHANGES IN HUMAN CEKEBELLUM WITH AGE 



21 



the right. I have studied this relation in eleven human cere- 

 bella and have found that in six cases out of the eleven the right 

 molecular Isijer is absolutely wider than the left, the left is wider 

 in four cases, and the two are the same width in one case. "\Mien, 

 however, I divided the values for the molecular layer by those for 

 the internal granular layer so as to get a ratio showing the rela- 

 tive thickness of the two layers, it appeared in ten cases out of 

 the eleven the right molecular layer was relatively thicker than 

 the left, and in the eleventh case the values were identical. It 



20 MONTHS 24 



Chart 5 The growth in the thickness of the molecular layer in ^ (manj during 

 the first twenty-four months of life. 



may be noted also that in only one case was the right internal 

 granular layer absolutely wider than the left. So in man it ap- 

 pears that the right molecular layer is relatively wider then con- 

 sidered in relation to the internal granular layer, and that the 

 left internal granular layer is absoluteh^ thicker than the right. 

 But what functional significance this has is uncertain. 



