GASSERIAN GANGLION: ALBINO RAT 



255 



of table 16 simply serve to indicate that the growth of the fibers 

 in diameter is somewhat less rapid in the ease of the fifth nerve 

 root than in the branches. 



THE MORPHOLOGICAL CHANGES IN THE GANGLION CELLS DURING 



GROWTH 



Using the material prepared for the present study, I have 

 also noted some of the morphological changes in the ganglion 

 cells, but since cytological studies were not originally planned, 

 my present observations are necessarily restricted. 



TABLE 16 



Based on table 15. Giving the ratios of the diameters of the nerve fibers in the several 

 branches and in the fifth nerve to the diameter of the nerve cells. The body weights 

 and ages for the nine groups here entered are given in table 15 



Plate 1 illustrates in semidiagrammatic form the larger cells 

 in the gasserian ganglion of the albino rat at birth and at 20, 

 100, and 485 days. The cells were enlarged proportionately 

 to the values of the diameters given in table 3. 



The cell body of the ganglion cells is relatively small at birth 

 (figs. 1 to 3), but the Nissl bodies are already well differentiated. 

 Such well-differentiated Nissl granules are also found in the cells 

 of intermediate and small size at this age, and well-developed 

 Nissl bodies may be seen even in the dendrites. However, during 

 this early period the Nissl bodies appear to be less abundant and 



