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  • Title: Action of serotonin and norepinephrine on spinal motoneurones following blockade of synaptic transmission.
    Author: Neuman RS.
    Journal: Can J Physiol Pharmacol; 1985 Jun; 63(6):735-8. PubMed ID: 2994874.
    Abstract:
    The actions of serotonin and norepinephrine were investigated on spinal motoneurones in isolated, hemisected rat and frog spinal cords. Serotonin and norepinephrine induced slowly developing depolarizations of spinal motoneurones which were frequently preceded by brief, low amplitude hyperpolarizations. Neither the depolarizations nor the hyperpolarizations were attenuated by 20 mM Mg2+ or tetrodotoxin, although synaptic transmission was blocked in both cases. It thus appears unlikely that the action of serotonin and norepinephrine on spinal motoneurone polarization and results from an indirect action via interneurones.
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