NERVOUS SYSTEM 



91 



geminus nerve (V) from birth to maturity measuring the 

 diameters of the largest myelinated fibers in both the sensory 

 root and the first, second and third branches and also the 

 diameters of the largest cells in the ganglion. The results are 

 given in table 52 and show that the fibers in the root have a 

 greater diameter than those in the branches. 



Diameter fnmicra 



Chart 10 Showing the corrected average diameters of the cell body and the 

 nucleus of the cortical nerve cells of the albino rat, plotted according to in- 

 creasing brain weight. Based on the data in table 49. Graph GC, average 

 diameter of the cell body of the ganglion cells in the lamina ganglionaris. Graph 

 GN, average diameter of the nuclei of the ganglion cells in the lamina ganglion- 

 aris. Graph PC, average diameter of the cell body of the pyramids in the lam- 

 ina pyramidalis. Graph PN, average diameter of the nuclei of the pyramids in 

 the lamina pyramidalis. X, 10 days of age. XX and.*, 20 days of age. **, 

 30 days of age. 



