NERVOUS SYSTEM 



97 



57 and chart 12. The analytical constants were also deter- 

 mined (vide loc. cit.). It may be noted that these cell bodies 

 are larger than those of the gangUon spirale and that they are 

 relatively well grown at birth. Further, the diameters tend to 

 increase with age. 



Spinal nerves and ganglia. For th*e study of the total number 

 of fibers (in all the spinal nerves of one side) Agduhr '20 ex- 

 amined five specimens of the house rat, Mus rattus. The method 



o 



25 



50 



50 100 200. 300 400 500 



Chart 11 Showing the computed diameters of the largest cell bodies and 

 their nuclei in the ganglion spirale^ — table 55. 



-Diameters of cell bodies 



•-Diameters of nuclei 



used was a modification of the Bielschowsky silver technic. 

 It was assumed that by this method all of the fibers, both myel- 

 inated and unmyelinated, were stained and so counted. The 

 data for each nerve are given separately in the original table. 

 Table 58 shows merely the total values. 



Agduhr calls attention to the increase in the number of fibers 

 in both roots with advancing age and body weight and to the 

 fact that in each case the number of fibers in the dorsal roots, 

 is about twice that in the ventral. 



