Figure 9.

T13 axon regeneration into the lumbosacral cord of rats with spinal hemisection. A, Reconstruction of labeling present on six sections (across 960 μm) in an animal 4 weeks after T13 nerve insertion. Red indicates labeling in the inserted nerve (primarily in the white matter). Green indicates gray-matter label. The dotted lines show the limits of the border of the inserted nerve, drawn from two sections. B, C, Two examples of Neurobiotin-labeled axons in the ventral horn 500 μm from the nerve-insertion site in animals 4 weeks after T13 insertion. Note the varicosities and proximity to large neurons in the ventral horn. Scale bars: A, 500 μm; B, C, 100 μm.