102 



ANATOMY 



For the numerical relations of cells and fibers in the second 

 cervical nerve data are furnished by Ranson ('06). Table 62. 



When the number of myelinated fibers in the two rami on 

 the distal side of the II cervical spinal ganglion is compared 

 with the total number counted in the two roots^ — a distal excess 

 in the number of fibers is found. This is shown in table 63. 

 The distal excess appears to be due to branching of the fibers 

 in their course, Ranson ('06). 



TABLE 62 



Second cervical nerve 



Observations on normal male rats (Albinos). Osmic acid fixation- — paraffin sections 



TABLE 63 



Enumerations of the myelinated fibers in the ventral roots 

 of the II spinal nerve of the Albino have been made by Dunn 

 (-'12). Each record is the mean of two enumerations of rats of 

 like age. Areas in m" of the entire fiber and of the axis are 

 given^ — together with the percentage value of the axis. Each 

 entry is based on the mean of the 20 largest fibers. In this 

 series there is a change in the relative area of the axis with age, 



