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Membrane potential changes of skeletomotor neurons in response to random stretches of the triceps surae muscles in decerebrate cats

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Abstract

The properties of membrane potential changes of skeletomotor neurons (S, FR, and FF) innervating triceps surae muscles during pseudorandom stretching of these muscles were studied in decerebrate cats. Peak amplitudes of pseudorandom muscle stretches ranged from 119 μm to 4.15 mm peak-to-peak. Sequences of ten identical stretching periods were applied for averaging. Shapes of membrane potential changes and probability density distribution of amplitudes of the input and output signals and power spectra suggest that the skeletomotor neuron membrane has nonlinear properties. First-and second-order Wiener kernels were determined by applying the cross-correlation (Lee-Schetzen) method. The results suggest that the transfer function between muscle stretches and subthreshold membrane potentials is a Wiener-type cascade. This cascade is consistent with a linear, second-order, underdamped transfer function followed by a simple quadratic nonlinearity [linear (L) system followed by nonlinear (N) system, or LN cascade]. Including the nonlinear component calculated from the second-order Wiener kernel improved the model significantly over its linear counterpart, especially in S-type motoneurons. Qualitatively similar results were obtained with all types of motoneurons studied.

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Authors and Affiliations

  1. University of Illinois, 1919 West Taylor Street, 4th Floor, 60612, Chicago, IL, USA

    Djordje Boskov

  2. Institute of Medical Research, Dr. Subotica 4, P.O. Box 721, 11001, Belgrade, Yugoslavia

    Djordje Boskov, Mirjana Jocic, Ksenija Jovanovic, Milos Ljubisavljevic & Radmila Anastasijevic

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  1. Djordje Boskov
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  2. Mirjana Jocic
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  3. Ksenija Jovanovic
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  4. Milos Ljubisavljevic
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  5. Radmila Anastasijevic
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Boskov, D., Jocic, M., Jovanovic, K. et al. Membrane potential changes of skeletomotor neurons in response to random stretches of the triceps surae muscles in decerebrate cats. Biol. Cybern. 71, 333–339 (1994). https://doi.org/10.1007/BF00239620

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  • DOI: https://doi.org/10.1007/BF00239620

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