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Contrôle pyramidal de l'activité des fibres fusimotrices dynamiques et statiques chez le chat

Pyramidal control of the dynamic and static fusimotor fibres activity in the cat

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Summary

  1. 1.

    Effects of repetitive stimulations of the sensorimotor cortex and the pyramidal tract were studied on the static discharge and dynamic sensitivity of contralateral flexor (tibial anterior) and extensor (soleus) muscle spindle primary endings in cats anaesthetized with Halothane (Fluothane).

  2. 2.

    Under light anaesthesia, cortical and pyramidal stimulations decrease the static discharge and the dynamic sensitivity of the soleus muscle spindle primary endings (depressant effect).

  3. 3.

    Under moderate anaesthesia, cortical and pyramidal stimulations mainly induce a powerfull increase of the dynamic sensitivity and a slight augmentation of the static discharge in the soleus muscle spindle primary endings (facilitatory dynamic effect). Less often, the same stimulations strongly increase the static discharge and decrease the dynamic sensitivity of the soleus primary endings (facilitatory static effect).

  4. 4.

    Whatever the level of anaesthesia, cortical and pyramidal stimulations induce only facilitatory effects, mainly dynamic and sometimes static on the tibial anterior muscle spindle primary endings.

  5. 5.

    A complete lesion of the ipsilateral red nucleus does not modify the fusimotor effects elicited by stimulations of the sensorimotor cortex.

  6. 6.

    Cortical fusimotor effects are suppressed by an electrocoagulation of the ipsilateral pyramidal tract.

  7. 7.

    The gyrus sigmoidus posterior and the gyrus sigmoidus anterior are mainly responsible for these fusimotor effects.

  8. 8.

    Cortical and pyramidal fusimotor effects were compared with the effects of gamma dynamic and gamma static fibers stimulations.

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  1. C.N.R.S. Institut de Neurophysiologie et Psychophysiologie 31 Chemin Joseph Aiguier, 13, Marseille 9°, France

    J. P. Vedel & J. Mouillac-Baudevin

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  1. J. P. Vedel
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  2. J. Mouillac-Baudevin
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Vedel, J.P., Mouillac-Baudevin, J. Contrôle pyramidal de l'activité des fibres fusimotrices dynamiques et statiques chez le chat. Exp. Brain Res. 10, 39–63 (1970). https://doi.org/10.1007/BF00340518

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  • DOI: https://doi.org/10.1007/BF00340518

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