Figure 4.

Appearance of a nerve root (NR), arterial nervorum (AN), and endothelial cells of the ANs (E) at the L₃ level on the non-plegic side. Endothelial shrinkage, angulation, and cellular loss are seen in ANs of the nerve root at the level of L₆ on the plegic side (H&E, ×100, LM). Degenerated axons, myelin sheath derangements, and axonal loss are seen on the plegic side (H&E, ×200, LM).