Fig 7. Light and electron micrographs in the cauda equina at the site of constriction after 3 weeks.

A, Light microscopy revealed nerve fiber degeneration. (Toluidin blue stain, x50).

B, Electron microscopy revealed abundance of macrophages phagocytosing the degenerated myelin sheath (x1500).

C, High magnification of a capillary revealed separation of the tight junction to allow communication between the vascular lumen and endoneurial space, indicating breakdown of the blood-nerve barrier and a macrophage capable of passing through the vessel walls (x5000).