502 



M. J. GREENMAN 



SECTIONAL AREAS OF FIBERS FROM THE OPERATED NERVE 



We note in table 10, that the average sectional areas of the 

 fibers of both the proximal and the distal ends of operated nerves 

 are much less than the average sectional area of the fibers of the 

 control nerves. Considering only the data given in group 1, we 

 note that the average for the fibers from the proximal ends of 

 the operated nerves is 55.8 square micra or 15 per cent less than 

 the average for the fibers of the control nerves. Sections from 

 the controls were taken midway in the course of the nerve and 

 hence should be expected to show smaller fibers than those at 

 the proximal end of the operated nerve. 



Also, the average of the fibers of the distal ends of the oper- 

 ated nerves is 29.9 square micra or 54 per cent less than the 

 average of the fibers of the control nerves. These last, however, 

 are newly formed fibers and hence form a class different from 

 either the control fibers or the proximal operated. 



From table 10, we note that no. 106 was an adult animal 

 (276 days of age) which was killed 26 days after the operation. 

 Its control fibers average 65.5 square micra, its proximal fibers 

 57 square micra and its distal fibers 20.7 square -micra. 



TABLE 11 



No. 154 was a much younger animal (129 days of age) and 

 was killed 98 days after operation. Its control fibers average 

 57.9 square micra, its proximal fibers 58.9 square micra and its 

 distal fibers 34.5 square micra. Placing these data in tabular 

 form for convenience of comparison, we have table 11. 



It is evident that no. 154, the younger animal, after a greater 

 lapse of time (98 days) has been able to repair more completely 

 the fibers in the proximal segment of the operated nerve and 

 to regenerate in the distal segment fibers more nearly equal in 



