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

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 Res

authors

Pierrot-Deseilligny E

doi

10.1016/s0079-6123(08)62225-6

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

305-14; discussion 295-7

eissn

0079-6123

issn

1875-7855

pii

S0079-6123(08)62225-6

journal_volume

80

pub_type

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