I
 am glad the Palmgren method for peripheral nerves has been 
brought up - it gives me the excuse to draw your attention to a 
valuable paper on peripheral nerve demonstration evaluation.
Try:
Page KM. 1970. Histological methods for peripheral nerves. J Med 
Lab Technol. 27:1-17

p.s..  My prefered method was Glees-Marsland.

Russ Allison, 
Dental School
Cardiff
Wales