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Selective central control of dynamic gamma motoneurons utilised for the functional classification of gamma cells

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Muscle Receptors and Movement

Summary

This report deals with supraspinal control of gamma motoneurons. Knowledge about a system originating in the rubral region in the mesencephalon, possibly from the rostral part of the red nucleus itself, is reviewed in particular. The pathway from this region (denoted the mesencephalic area for dynamic control (MesADC-region)) descends ipsilaterally down to the medullary level, sends collaterals to the inferior olivary nuclear complex and then crosses the midline to proceed in the dorsolateral funiculus of the contralateral spinal cord.

The MesADC-system acts on dynamic gamma motoneurons without any simultaneous effects on static gamma or on alpha motoneurons. A technique is described for the selective activation of the MesADC-system. It is argued that such selective activation can be used experimentally for the functional classification of gamma motoneurons. The MesADC-system furnishes an example of a motor system organised in a way not easily compatible with current ideas of alpha-gamma linkage.

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Authors and Affiliations

  1. Department of Physiology, University of Umeå, Sweden

    B. Appelberg

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  1. B. Appelberg
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Editor information

Editors and Affiliations

  1. Sherrington School of Physiology, St Thomas’s Hospital Medical School, London, SE1 7EH, UK

    A. Taylor  & A. Prochazka  & 

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Appelberg, B. (1981). Selective central control of dynamic gamma motoneurons utilised for the functional classification of gamma cells. In: Taylor, A., Prochazka, A. (eds) Muscle Receptors and Movement. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-06022-1_11

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