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A nociceptor (from Latin nocere 'to harm or hurt'; lit. ' pain receptor ' ) is a sensory neuron that responds to damaging or potentially damaging stimuli by sending "possible threat" signals [ 1 ] [ 2 ] [ 3 ] to the spinal cord and the brain.
In physiology, nociception (/ˌnəʊsɪˈsɛpʃ(ə)n/), also nocioception; from Latin nocere 'to harm/hurt') is the sensory nervous system's process of encoding noxious stimuli.
The nociceptin opioid peptide receptor (NOP), also known as the nociceptin/orphanin FQ (N/OFQ) receptor or kappa-type 3 opioid receptor, is a protein that in humans is encoded by the OPRL1 (opioid receptor-like 1) gene. [5]
External receptors that respond to stimuli from outside the body are called exteroreceptors. [4] Exteroreceptors include chemoreceptors such as olfactory receptors and taste receptors, photoreceptors (), thermoreceptors (temperature), nociceptors (), hair cells (hearing and balance), and a number of other different mechanoreceptors for touch and proprioception (stretch, distortion and stress).
It is argued that MIAs, or C-MiHi primary afferents, are crucial to the initiation of primary hyperalgesia because they have a significant response to capsaicin, which is a chemical commonly used to induce hyperalgesia. Secondary hyperalgesia is believed to be caused by a magnified spinal response to nociceptor stimulation.
Watch firsthand, in 360 video, as Susan Sarandon listens and learns about refugees' hopes, dreams and journeys
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Nociceptin/orphanin FQ (N/OFQ), a 17-amino acid neuropeptide, is the endogenous ligand for the nociceptin receptor (NOP, ORL-1). Nociceptin acts as a potent anti-analgesic, effectively counteracting the effect of pain-relievers; its activation is associated with brain functions such as pain sensation and fear learning.