Universität zu Köln

Toth, Tibor Istvan, Grabowska, Martyna ORCID: 0000-0002-1727-7714, Schmidt, Joachim, Bueschges, Ansgar and Daun-Gruhn, Silvia (2013). A Neuro-Mechanical Model Explaining the Physiological Role of Fast and Slow Muscle Fibres at Stop and Start of Stepping of an Insect Leg. PLoS One, 8 (11). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. ISSN 1932-6203

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Abstract

Stop and start of stepping are two basic actions of the musculo-skeletal system of a leg. Although they are basic phenomena, they require the coordinated activities of the leg muscles. However, little is known of the details of how these activities are generated by the interactions between the local neuronal networks controlling the fast and slow muscle fibres at the individual leg joints. In the present work, we aim at uncovering some of those details using a suitable neuromechanical model. It is an extension of the model in the accompanying paper and now includes all three antagonistic muscle pairs of the main joints of an insect leg, together with their dedicated neuronal control, as well as common inhibitory motoneurons and the residual stiffness of the slow muscles. This model enabled us to study putative processes of intra-leg coordination during stop and start of stepping. We also made use of the effects of sensory signals encoding the position and velocity of the leg joints. Where experimental observations are available, the corresponding simulation results are in good agreement with them. Our model makes detailed predictions as to the coordination processes of the individual muscle systems both at stop and start of stepping. In particular, it reveals a possible role of the slow muscle fibres at stop in accelerating the convergence of the leg to its steady-state position. These findings lend our model physiological relevance and can therefore be used to elucidate details of the stop and start of stepping in insects, and perhaps in other animals, too.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Toth, Tibor Istvan UNSPECIFIED UNSPECIFIED UNSPECIFIED Grabowska, Martyna UNSPECIFIED orcid.org/0000-0002-1727-7714 UNSPECIFIED Schmidt, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED Bueschges, Ansgar UNSPECIFIED UNSPECIFIED UNSPECIFIED Daun-Gruhn, Silvia UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-471857
DOI:	10.1371/journal.pone.0078246
Journal or Publication Title:	PLoS One
Volume:	8
Number:	11
Date:	2013
Publisher:	PUBLIC LIBRARY SCIENCE
Place of Publication:	SAN FRANCISCO
ISSN:	1932-6203
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COXAL DEPRESSOR MUSCLES; STICK INSECT; INHIBITORY MOTONEURONS; FILTER CHARACTERISTICS; NEUROMECHANICAL MODEL; SEARCHING MOVEMENTS; PATTERN GENERATION; SENSORY CONTROL; WALKING; JOINT Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47185