Passive resting state and history of antagonist muscle activity shape active extensions in an insect limb.

Journal of Neurophysiology
Jan M Ache, T Matheson

Abstract

Limb movements can be driven by muscle contractions, external forces, or intrinsic passive forces. For lightweight limbs like those of insects or small vertebrates, passive forces can be large enough to overcome the effects of gravity and may even generate limb movements in the absence of active muscle contractions. Understanding the sources and actions of such forces is therefore important in understanding motor control. We describe passive properties of the femur-tibia joint of the locust hind leg. The resting angle is determined primarily by passive properties of the relatively large extensor tibiae muscle and is influenced by the history of activation of the fast extensor tibiae motor neuron. The resting angle is therefore better described as a history-dependent resting state. We selectively stimulated different flexor tibiae motor neurons to generate a range of isometric contractions of the flexor tibiae muscle and then stimulated the fast extensor tibiae motor neuron to elicit active tibial extensions. Residual forces in the flexor muscle have only a small effect on subsequent active extensions, but the effect is larger for distal than for proximal flexor motor neurons and varies with the strength of flexor activation. We...Continue Reading

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Citations

Jul 28, 2019·The Journal of Experimental Biology·Catherine E KehlHillel J Chiel
Oct 15, 2019·PLoS Computational Biology·Nalin HarischandraVolker Dürr
Dec 1, 2012·The Journal of Experimental Biology·Eva BergJoachim Schmidt

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