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Previous studies have indicated that thalamic nucleus submedius (Sm) is involved in nociceptive modulation and plays an important role in an endogenous analgesic system (a feedback loop) consisting of spinal cord (Sc)–Sm-ventrolateral orbital cortex–periaqueductal gray–Sc. However, the function of different types of Sm neurons in nociceptive modulation is unclear. For this reason, on the basis of...
Our previous findings have indicated that the ventrolateral orbital cortex (VLO) may be involved in modulation of nociception and plays an important role as a higher center of an endogenous analgesic system (a feedback loop) consisting of spinal cord-nucleus submedius (Sm)-VLO-periaqueductal gray (PAG)-spinal cord. To further investigate the neurotransmitter mechanism involved in this nociceptive...
The present study found in lightly anesthetized rats that the radiant heat-evoked tail flick (TF) reflex was markedly inhibited by a unilateral electrical stimulation (a 20 ms train of 0.2 ms, 100 Hz, 30–100 μA pulses) of the ventrolateral orbital cortex (VLO), with the tail flick latency (TFL) being increased. The mean threshold of VLO stimulation for producing inhibition of the TF reflex was 39...
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