L32 



ANATOMICAL AND PHYSIOLOGICAL STUDIES ON 



age advances, the size of both the cell body and of the nucleus 

 slowly diminishes, while within the cytoplasm the differentiation 

 of the Nissl bodies progresses. This relation is seen in the figure 

 of the cell at 366 days, which shows that the absolute volume 

 of the cell body and also of the nucleus is smaller than at twenty 

 days. 



From twenty to 366 days, gradual and progressive changes 

 in all histological structures can be seen, though there are no 

 sudden changes. 



TABLE 100 



Diameters of the cell bodies and their nuclei in the ganglion spirale — in cross sections 



of the cochlea (chart 4'2) 



The question here arose whether this change in volume was 

 in any way related to a shift in the long axis of the cell at the 

 later ages. To answer this difficult question it was deemed 

 desirable to compare the form of the ganglion cells obtained in 

 the cross-section with that found in the radial section of the 

 cochlea. In table 100 (chart 42) are given the values for the 

 diameters of the cell bodies and their nuclei in the ganglion 

 spirale in the cross-section. Below are given the respective 

 ratios from 15 to 25, 15 to 371, and 25 to 371 days. Both cell 

 body and nucleus increase in size up to twenty days and then 

 diminish very slowly, as the age advances. These are similar 

 to the relations found in the radial sections. 



