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Microinjection of serotonin and 5-hydroxytryptamine2(5-HT2)agonist 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) in nucleus ambiguus caused excitation of posterior cricoarytenoid (PCA) muscles of the larynx in anesthetized, spontaneously breathing cats. Intravenous administration of 5-HT2antagonist ketanserin produced complete block of excitatory effect of DOM injection. Electrical stimulation of nucleus raphe pallidus caused excitation of PCA activity, that was blocked by pretreatment of ketanserin. These results indicate that serotonergic cells in the-raphe pallidus provide tonic drive to medullary PCA motoneurons through 5-HT2receptors. © 1995.




Arita, H., Ichikawa, K., & Sakamoto, M. (1995). Serotonergic cells in nucleus raphe pallidus provide tonic drive to posterior cricoarytenoid motoneurons via 5-hydroxytryptamine2receptors in cats. Neuroscience Letters, 197(2), 113–116. https://doi.org/10.1016/0304-3940(95)11907-E

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