Peripheral and descending control of neurones mediating non-monosynaptic Ia excitation to motoneurones: a presumed propriospinal system in man.

摘要: Evidence for a non-monosynaptic Ia excitation of wrist flexor and quadriceps motoneurones (MNs) in man has been provided while using two independent methods: construction post-stimulus time histograms (PSTHs) voluntarily activated motor units the spatial facilitation H-reflex. This long central latency (3–6 ms) very low threshold. Neurones mediating this effect seem to receive strong descending at onset voluntary movement it is argued that they might mediate part command MNs. contrast, increasing afferent input produces an inhibition transmission pathway. Several characteristics its depression bear resemblance those C3–C4 propriospinal system cat, which used as model discussion present results.