46 



ANATOMY 



For the numerical relations of cells and fibers in the second 

 cervical nerve data have been furnished by Ranson ('06). 



TABLE 28 



Second cervical nerve 

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



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 found in the two roots a distal excess in the 

 number of fibers is found. This is shown in table 29. The dis- 

 tal excess appears to be due to branching of the fibers in their 

 course, Ranson ('06). 



TABLE 29 



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 /j. 2 of the entire fiber and of the axis 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 



