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The effects of transplanted embryonic spinal tissue on host motor nerve regeneration and target muscle reinervation were investigated in severed sciatic nerves of rats. The electromyogram (EMG) responses and number of motor end plates (MEP) in target muscles, number of nerve axons, and retrogradely labeled motor neurons were examined in transplantation-, anastomosis without transplantation-, and naïve groups of the animals. The EMG patterns of the transplantation group returned to nearly normal at the 8th week, but those of the anastomosis group did not. MEP counts in the transplantation group were significantly higher than in the anastomosis group. The myelinated axon counts and myelin sheath thickness in the transplantation group were significantly higher than those in the anastomosis group. The number of retrogradely labeled motor neurons was significantly higher in the transplantation group. We conclude that transplanted embryonic spinal tissue can promote both host motor nerve regeneration and target muscle reinnervation.

Transplanted embryonic spinal tissue promotes severed sciatic nerve regeneration in rats