Abstract:
: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 of post-stimulus time histograms (PSTHs) of voluntarily activated motor units and the spatial facilitation of the H-reflex. This non-monosynaptic Ia excitation has a long central latency (3-6 ms) and a very low threshold. Neurones mediating this effect seem to receive a strong descending excitation at the onset of voluntary movement and it is argued that they might mediate part of the descending command to MNs. In contrast, increasing the afferent input produces an inhibition of the transmission in this pathway. Several characteristics of the non-monosynaptic excitation and its depression bear resemblance to those of the C3-C4 propriospinal system in the cat, which is used as a model for the discussion of the present results.
journal_name
Prog Brain Resjournal_title
Progress in brain researchauthors
Pierrot-Deseilligny Edoi
10.1016/s0079-6123(08)62225-6subject
Has Abstractpub_date
1989-01-01 00:00:00pages
305-14; discussion 295-7eissn
0079-6123issn
1875-7855pii
S0079-6123(08)62225-6journal_volume
80pub_type
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