Fig. 6. High magnification view of the surface of a muscle fibre showing an unstained axon that consequently appears light in density, surrounded by heavily stained glial cells. Darkly stained plaques can be seen along the axon. The outer perimeter (arrow, G) of the glial cells is lightly stained. The stain is Vector Red. A, axon; M, muscle fibre; N, muscle nucleus; P, plaque. Bar, 10 µm.