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Afferent influences upon human genioglossal muscle

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Summary

Although extrinsic tongue muscles in man have been reported to contain muscle spindles, it has not been possible to record by electromyography any reflex response in the genioglossal muscle of healthy subjects upon stretching the tongue or upon electrical stimulation of the hypoglossal nerve. Neither could a silent period be evoked in the muscle following its twitch contraction. Nociceptive stimulation of the tongue mucosa during tongue protrusion elicited a crossed inhibitory reflex response in the genioglossal muscle. This reflex, conveyed centrally through the lingual nerve, could be involved in the prevention of tongue injuries during mastication.

Zusammenfassung

Es wird berichtet, daß die Zungenmuskulatur des Menschen Muskelspindeln enthält. Dennoch war es am Normalen nicht möglich, elektromyographisch eine Reflexantwort im Musculus genioglossus nach Strecken der Zunge oder elektrischer Reizung des Nervus hypoglossus zu erhalten. Auch konnte in diesem Muskel nach Kontraktion infolge Nervenreizung keine silent period nachgewiesen werden. Nocizeptive Reize der Zungenschleimhaut während des Herausstreckens der Zunge bewirkten gekreuzte Hemmreflexe im M. genioglossus. Diese Reflexe wurden durch den N. lingualis zentripetal geleitet und können eine Rolle beim Verhindern von Zungenverletzungen während des Kauaktes spielen.

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Bratzlavsky, M., vander Eecken, H. Afferent influences upon human genioglossal muscle. J. Neurol. 207, 19–25 (1974). https://doi.org/10.1007/BF00312589

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