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. 2012 Oct;64(4):939–971. doi: 10.1124/pr.112.006163

Fig. 10.

Fig. 10.

Capsaicin-induced hyperexcitability of dorsal horn neurons. Peripheral application of capsaicin (such as by intradermal injection) excites afferent Aδ and C fibers. The ongoing input into the dorsal horn of the spinal cord is believed to underlie the development of hyperexcitability of spinal neurons and leads to secondary hyperalgesia and allodynia.