REGENERATION OF PERIPHERAL NERVES 



485 



were so modified as to suggest readjustment of muscular control 

 so as to mask in a measure the paralysis produced by the 

 operation. 



The evidence from the three-day and four-day specimens seems 

 conclusive that by the fourth day degeneration is complete. 



NUMBER OF FIBERS IN PERONEAL NERVE OF NORMAL ANIMAL 



Series 3 was prepared to determine, among other facts, the 

 number of fibers in the peroneal nerve of the normal animal. 

 Three young unoperated adults were used. Of each nerve three 

 counts were made, one for each end and one for the middle. 

 The distances between counts were also determined. Referring 



TABLE 1 



First or proximal count 



Distance in n from 1st to 2d count . 



Second or middle count 



Distance in n from 2d to 3d count . 

 Third or distal count 



Average count 2250 



NO. 224 9 



UNOPERATED 



BIGHT NERVE, 



WEIGHT 104 



2240 



2118 

 2392 



3031 

 4466 



NO. 223 9 



UNOPERATED 



RIGHT NERVE, 



WEIGHT 117 



2430 

 2292 

 2213 



2312 



4746 

 2345 



NO. 222 cf 



UNOPERATED 

 LEFT NERVE, 

 WEIGHT 182 



2192 



2418 

 2364 



2325 



3080 

 3332 



Combined average count, 2296 

 Average of the proximal counts, 2288 

 Average of the middle counts, 2276 



Average of the distal counts, 2323 

 Average body weight, 135 



to table 1, we note that the average number of fibers at the three 

 levels in no. 224 is 2250, in no. 223 it is 2312 and in no. 222 it 

 is 2325. The combined average counts of all three specimens 

 is 2296 for an average body weight of 135 grams. 



Various studies on the peripheral nerves by others (Dunn '00) 

 indicate that substantial symmetry exists normally between the 

 nerves of the two sides of the body in respect to their numerical 

 composition. This view is supported by our own direct 

 observations. 



