Ingbert, Ventral Roots of spinal Noves. 223 



TABLE IV. 



Giving the percentage values of the cross-section of the ventral 

 roots of the spinal nerves as compared with the percentage distribution 

 of the number of medullated nerve fibers in each ventral root. The 

 greatest value in each series is taken as ioo%. 



No. of spinal Percentage Value. (Ingbert) Male, 



nerves Areas No. of Fibers 



I 8.9 25.1 



II 24.5 31.3 



III ii.o 28.4 

 -g IV 29.9 43.9 



- V lOO.O lOO.O 



fe VI 95.7 87.0 



O VII 43.4 65.8 



VIII 54.1 62.2 



I 27.0 53.6 



II 16.0 41-5 



III 18.9 53-4 



IV 15-7 56.3 



o V 18.9 48.2 



§ VI 18.5 46.5 



o VII 16.4 41.7 



p VIII 17.4 44.8 



IX 17.4 42.7 



X 20.6 52.9 



XI 20.3 57.3 



XII 21.3 56.0 



^ I 23.5 58.7 



% II 28.9 44.4 



H III 66.5 82.2 



J IV 45.2 54.2 



V 77.2 76.5 



I 70.5 63.4 



•g II 21.7 32.5 



u III 6.0 17.3 



-S: IV 3.5 16.4 



V 3.2 12.7 



6 I 0.7 3.8 



VI. The Relation Between the Ventral and Dorsal Roots. 



I. Relation of Areas of Cross-sections. — For comparison 

 we have arranged the areas of the ventral and dorsal roots in 

 tabular form, adding the measurements by Kolliker (1S50, p. 

 433) on the spinal nerves of a female. 



