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Cannabis is reported to be remarkably effective for the relief of otherwise intractable pain. However, the bases for pain relief afforded by this psychotropic agent are debatable. Nonetheless, the frontal-limbic distribution of cannabinoid receptors in the brain suggests that cannabis may target preferentially the affective qualities of pain. This central mechanism of action may be relevant to cannabinoid...
Mechanical hyperalgesia may develop following tissue inflammation or nerve injury. Basically, peripheral sensitization leads to primary hyperalgesia at the site of injury, whereas secondary hyperalgesia occurs in the surrounding tissue and results from central sensitization. The present study focuses on the cerebral processing of secondary mechanical hyperalgesia. Primary (S1) and secondary (S2) somatosensory...
To investigate the role of prostaglandin E 2 (PGE 2 ) in the brain in nociception electrophysiologically, we injected PGE 2 (0.1 fmol-1 nmol) into the lateral cerebroventricle (LCV) of anesthetized rats and observed the changes of the responses of the wide dynamic range (WDR) neurons in the trigeminal nucleus caudalis to noxious pinching of facial skin. The LCV injection of...
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