Abstract

We have examined the labeling pattern in the spinal dorsal horn by an intra-sciatic nerve injection of cholera toxin B subunit conjugated horseradish peroxidase (HRP) after transection of the posterior cutaneous nerve and inferior gluteal nerve, and found that the cholera toxin B subunit conjugated HRP labeling in lamina I was expanding into lamina II and there was a shrinking gap between lamina I and lamina III. This result suggests that A-fibre sprouting arise after peripheral nerve injury, but mainly from small calibre Aδ-fibres which terminate in lamina I.

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