FIG. 4.

Histology of crush injuries combined with 50 g traction and malleus nipper injuries without traction demonstrated only minimal signs of endoneurial and perineurial injury. The overall appearance of these injuries conformed to simple axonotmetic injuries. Comparison at 5 days of crush with traction Masson's trichrome (A), and neurofilament-200 immunostains (C), with malleus nipper compression without traction (B and D) injury zones that show findings similar to simple crush injury morphology. The white arrows point to perineurial disruption, and the yellow arrows to minimal aberrant axonal growth. All figures are oriented proximal (left) to distal (right; scale bar=250 μm in A and B; scale bar=100 μm in C and D). Color image is available online at www.liebertonline.com/neu