Effects of partial unfused contractions of the gastrocnemius medialis muscle on homonymous and synergist motor neurons in cats |
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Authors: | G Horcholle-Bossavit L Jami J Lafleur F Lamy D Zytnicki |
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Affiliation: | Laboratoire de Neurophysiologie, Collège de France, Paris. |
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Abstract: | Autogenetic inhibition of homonymous and synergist motoneurones can be elicited by very weak partial twitches of gastrocnemius medialis muscle, but during sustained contractions the amplitude of inhibitory post-synaptic potentials decreases quickly. A similar decrease also occurs during stronger contractions. The mechanism responsible for this decrease is still active in low spinal preparations. Pre-synaptic inhibition of Ib afferent fibres might contribute to this reduction of efficiency in the transmission of Ib afferent inputs to motoneurones. |
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