The effects of trimethadione on pentetrazol-induced discharges of primary muscle spindle afferents from the hind limb of the rat.
1 Recordings have been made from primary muscle spindle afferents in split dorsal root filaments of rats anaesthetized with urethane. 2 Injection of pentetrazol (PTZ, 10 mg/kg) produced elevated discharge in the afferents with intact efferents without any charge in tension or electrical activity of the muscle of origin. 3 This elevated discharge was found to contain elements of both gamma d and gamma s activation. 4 Trimethadione (100 mg/kg), itself produced a transient increase in discharge and effectively suppressed PTZ-induced discharges of the afferents for at least 2 h. 5 These results are discussed in the context of established effects on sensory and motor systems.
D000344:Afferent Pathways / Q000187:drug effects; D000818:Animals; D005260:Female; D006614:Hindlimb; D066298:In Vitro Techniques; D009470:Muscle Spindles / Q000187:drug effects*; D010080:Oxazoles / Q000494:pharmacology*; D010433:Pentylenetetrazole / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D051381:Rats; D013126:Spinal Nerve Roots / Q000502:physiology; D014293:Trimethadione / Q000494:pharmacology*
D010080:Oxazoles; D014293:Trimethadione; D010433:Pentylenetetrazole