Figure 2From: Psychological stress and fibromyalgia: a review of the evidence suggesting a neuroendocrine linkScheme showing the pain-modulating pathways in the dorsal horn of the spinal cord. Nociceptive A-delta fibres and nociceptive C fibres cause release of substance P in the dorsal horn. Serotonin released by the dorsolateral inhibitory tracts inhibits the release of substance P.Back to article page