The Journal of 

 Comparative Neurology and Psychology 



Volume XIV 



1904 



Number 3 



AN ENUMERATION OF THE MEDULLATED NERVE 

 FIBERS IN THE VENTRAL ROOTS OF THE 

 SPINAL NERVES OF MAN. 



By Charles E. Ingbert. 



(Frofn the Neurological Laboratory of the University of Chicago). 



With as Figures in the Text. 



1. Introduction. 

 II. Historical Statement . 



III. Determination of the areas of the cross-sections of the ventral roots of 

 the spinal nerves of man. 



1. Kolliker's determination. 



2. Stilling's determination. 



3. Author's determination. 



4. Comparison of areas. 



5. Discussion of Figures i and 2. 



IV. Determination of the number of nerve fibers in the ventral roots of the 

 spinal nerves of nian. 



1. Stilling's estimate. 



2. Author's enumeration. 



3. Comparison of Stilling's estimate with the author's enumeration. 



4. Determination of fine nerve fibers. 



V. The number of nerve fibers per square millimeter of the cross-section of 

 the ventral roots of the spinal nerves of man. 



1. Determinations and comparisons. 



2. Discussion of Figure 3. 



VI. Relation between th; ventral and dorsal roots. 



1. Relation of areas of cross-sections. 



2. Relation of the sizes of the nerve-fibers. 



3. Relation of numbers of nerve fibers. 



4. Comparison of the ratio of the number of nerve fibers in the ventral 

 and the dorsal roots of the frog, of the rat, and of man. 



5. Relation of small and large fibers. 



VII. On the relative area of the cross-section of the roots forming the brachial 

 and lu7nbo-sacral plexuses in the male and the female. 

 VIII. Summary. 

 IX. Tables and figures. 

 X. Bibliography . 



