Universität zu Köln

Hammel, Elzbieta, Mantziaris, Charalampos ORCID: 0000-0003-2280-1733, Schmitz, Joscha, Bueschges, Ansgar and Gruhn, Matthias (2022). Thorax-Segment- and Leg-Segment-Specific Motor Control for Adaptive Behavior. Front. Physiol., 13. LAUSANNE: FRONTIERS MEDIA SA. ISSN 1664-042X

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Abstract

We have just started to understand the mechanisms underlying flexibility of motor programs among segmental neural networks that control each individual leg during walking in vertebrates and invertebrates. Here, we investigated the mechanisms underlying curve walking in the stick insect Carausius morosus during optomotor-induced turning. We wanted to know, whether the previously reported body-side specific changes in a two-front leg turning animal are also observed in the other thoracic leg segments. The motor activity of the three major leg joints showed three types of responses: 1) a context-dependent increase or decrease in motor neuron (MN) activity of the antagonistic MN pools of the thorax-coxa (ThC)-joint during inside and outside turns; 2) an activation of 1 MN pool with simultaneous cessation of the other, independent of the turning direction in the coxa-trochanteral (CTr)-joint; 3) a modification in the activity of both FTi-joint MN pools which depended on the turning direction in one, but not in the other thorax segment. By pharmacological activation of the meso- or metathoracic central pattern generating networks (CPG), we show that turning-related modifications in motor output involve changes to local CPG activity. The rhythmic activity in the MN pools of the ThC and CTr-joints was modified similarly to what was observed under control conditions in saline. Our results indicate that changes in meso- and metathoracic motor activity during curve walking are leg-joint- and thorax-segment-specific, can depend on the turning direction, and are mediated through changes in local CPG activity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hammel, Elzbieta UNSPECIFIED UNSPECIFIED UNSPECIFIED Mantziaris, Charalampos UNSPECIFIED orcid.org/0000-0003-2280-1733 UNSPECIFIED Schmitz, Joscha UNSPECIFIED UNSPECIFIED UNSPECIFIED Bueschges, Ansgar UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruhn, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-661723
DOI:	10.3389/fphys.2022.883858
Journal or Publication Title:	Front. Physiol.
Volume:	13
Date:	2022
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	1664-042X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STICK INSECT WALKING; PATTERN GENERATING NETWORKS; SPINAL-CORD COORDINATION; TIBIA-CONTROL-SYSTEM; INTERSEGMENTAL COORDINATION; CARAUSIUS-MOROSUS; INTERJOINT COORDINATION; TEMPORAL RELATIONSHIPS; MOTONEURONAL ACTIVITY; HINDLIMB MOVEMENTS Multiple languages Physiology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66172