Distribution of rabies virus anterograde labeled fibers and terminals in the spinal dorsal horn projected from the ACC. A, The schematic figure showing the design of lentivirus-assistant rabies virus used for anterograde tracing. B-D, After the virus injection into one side of the ACC (B), virus infected fibers and terminals were distributed in the laminae I-III of the spinal cord (c4) (C-D). Rectangled areas of 1–5 in C and D were augmented in E-I respectively. Bars equal to 200 μm in B, 50 μm in C and D, 10 μm in E-I.