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The amygdala, periaqueductal gray (PAG), and rostral ventromedial medulla (RVM) are critical for the expression of some forms of stress-related changes in pain sensitivity. In barbiturate anesthetized rats, microinjection of agonists for the μ opioid receptor into the amygdala results in inhibition of the tail flick (TF) reflex evoked by radiant heat. We tested the idea that TF inhibition following...
The rat paw formalin test is a model of prolonged pain due to mild tissue injury. There is some evidence suggesting that morphine does not produce antinociception in the formalin test via the brain-stem and spinal cord circuitry normally associated with antinociception. Furthermore, morphine appears to require an intact forebrain in order to function as an analgesic for formalin pain. In the 2 experiments...
The rat paw formalin test is a model of prolonged pain due to mild tissue injury. There is some evidence suggesting that morphine does not produce antinociception in the formalin test via the brain-stem and spinal cord circuitry normally associated with antinociception. Furthermore, morphine appears to require an intact forebrain in order to function as an analgesic for formalin pain. In the 2 experiments...
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