Evidence suggesting a transcortical pathway from cutaneous foot afferents to tibialis anterior motoneurones in man

The Journal of Physiology
J NielsenB Fedirchuk

Abstract

1. Stimulation of the superficial peroneal or the sural nerve (3 shocks, 3 ms interval, 1 ms duration, 2.5 x perception threshold) evoked a reflex activation of the tibialis anterior muscle at a latency of approximately 70-95 ms in all of nine healthy human subjects. Stimulation of the medial plantar nerve only rarely produced similar effects. The possibility that a transcortical pathway contributes to these late reflex responses was investigated by combining the cutaneous stimulations and a transcranial magnetic stimulation of the contralateral motor cortex. 2. A significant facilitation of short-latency peaks in the post-stimulus time histogram of single tibialis anterior motor units evoked by the transcortical magnetic stimulation was observed in eight out of nine subjects following stimulation of the superficial peroneal or sural nerves at the latency of the long-latency reflex. In contrast such a facilitation was only rarely seen when the medial plantar nerve was stimulated. 3. With the same timing for the stimuli, the superficial peroneal and sural nerve stimulations also produced a significant increase in the short-latency, presumed monosynaptic, facilitation of the tibialis anterior H reflex produced by the brain stimul...Continue Reading

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Citations

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