GASSERIAN GANGLION: ALBINO RAT 



1. Absolute size at maturity 



261 



Diameters of cells and nuclei, table 18, have been based on 

 the average for the computed diameters of the last two entries 

 in the foregoing table 3 — for the cells in the gasserian ganglion 

 and for the cells of the seventh cervical ganglion — on the average 

 of the last three entries (in table 3, loc. cit.). 



TABLE 18 

 Computed diameters of mature cells 



The values just given show that when compared with the 

 cells of a spinal ganglion the largest cells of the gasserian ganglion 

 have a greater diameter, but the diameter of their nuclei is less 

 than those in the spinal ganglion cells. The nucleus-plasma 

 ratio must therefore be greater for the gasserian cells. Using 

 the foregoing values, these ratios stand as in table 19. 



We note here that a low nucleus-plasma ratio is characteristic 

 for cells which have not completed their growth. 



Turning to the fibers, we may compare the average diameters 

 of the entire fibers and their axes in the root of the fifth cranial 

 nerve (average of last three entries in table 10) with the corre- 

 sponding measurements on the dorsal root fibers of the seventh 

 cervical spinal nerve (average of last three entries in table 2, 

 loc. cit.). 



