Fig. 3. Comparison of neuropathology scores of nerve sections from experimental groups studied 7 days after application of saline (control) or 0.625, 1.25, or 2.5 mg amitriptyline. A score of 0 indicates normal tissue, and a score of 4 indicates Wallerian degeneration of nerve fibers throughout the tissue section. Each treatment group is statistically different from the control group (P < 0.01).