Figure 5: Toluidine blue staining of cavernous nerves: (a) Group 1, (b) Group 2, (c) Group 3, (d) Group 4. In (a), there was neuroma formation. In (b), there was a paucity of myelinated axon of regenerated cavernous nerve into and through the vein cavity. In (c), there was a significant increase in the number of myelinated axon of regenerated cavernous nerve relative to (b). In (d), there was abundant of myelinated axons of cavernous nerves that had a normal morphological appearance. All ×1000 Scale bars: 600 μm.