Role of different brain areas in peripheral nerve injury-induced neuropathic pain
- PMID: 21238432
- DOI: 10.1016/j.brainres.2011.01.002
Role of different brain areas in peripheral nerve injury-induced neuropathic pain
Abstract
Neuropathic pain has been described as the "most terrible of all tortures which a nerve wound may inflict" and arises as a consequence of nerve injury either of the peripheral or central nervous system. Following peripheral nerve injury, a cascade of events in the primary afferents leads to peripheral sensitization resulting in spontaneous nociceptor activity, decreased threshold and increased response to supra-threshold stimuli. A series of molecular changes in spinal cord and brain centers are associated with central sensitization which is responsible for the pain to non-injured extra-territory regions (extraterritorial pain) and contralateral parts (mirror-image pain). The peripheral nerve injury has been reported to induce neuroplastic changes in different brain regions including the anterior cingulate cortex, insular cortex, ventrolateral orbitofrontal area, amygdala, striatum, thalamus, hypothalamus, rostral ventromedial medulla, periaqueductal gray, pons (locus coeruleus), red nucleus, and medulla oblongata. The present review article discusses the involvement of these different brain areas in the development of peripheral nerve injury-induced neuropathic pain.
Copyright © 2011 Elsevier B.V. All rights reserved.
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