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  • Title: Collateral projections of single neurons in the nucleus raphe magnus to both the sensory trigeminal nuclei and spinal cord in the rat.
    Author: Li YQ, Takada M, Shinonaga Y, Mizuno N.
    Journal: Brain Res; 1993 Feb 05; 602(2):331-5. PubMed ID: 8448674.
    Abstract:
    After injecting Diamidino yellow and Fast blue respectively into the sensory trigeminal nuclei and spinal cord, we observed doubly labeled cells in the nucleus raphe magnus (NRM). Combining the fluorescent retrograde double labeling with serotonin (5-HT) immunofluorescence histochemistry, we further found that about 30% of the doubly labeled NRM neurons showed 5-HT-like immunoreactivity (5-HT-LI). Such 5-HT-LI NRM neurons may modulate nociceptive activities simultaneously in the sensory trigeminal nuclei and spinal cord by sending axon collaterals to these regions.
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