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Central Generation of Grooming Motor Patterns and Interlimb Coordination in Locusts

Berkowitz, Ari and Laurent, Gilles (1996) Central Generation of Grooming Motor Patterns and Interlimb Coordination in Locusts. Journal of Neuroscience, 16 (24). pp. 8079-8091. ISSN 0270-6474. PMCID PMC6579234. doi:10.1523/jneurosci.16-24-08079.1996.

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Coordinated bursts of leg motoneuron activity were evoked in locusts with deefferented legs by tactile stimulation of sites that evoke grooming behavior. This suggests that insect thoracic ganglia contain central pattern generators for directed leg movements. Motoneuron recordings were made from metathoracic and mesothoracic nerves, after eliminating all leg motor innervation, as well as all input from the brain, subesophageal ganglion, and prothoracic ganglion. Strong, brief trochanteral levator motoneuron bursts occurred, together with silence of the slow and fast trochanteral depressor motoneurons and activation of the common inhibitor motoneuron. The metathoracic slow tibial extensor motoneuron was active in a pattern distinct from its activity during walking or during rhythms evoked by the muscarinic agonist pilocarpine. Preparations in which the metathoracic ganglion was isolated from all other ganglia could still produce fictive motor patterns in response to tactile stimulation of metathoracic locations. Bursts of trochanteral levator and depressor motoneurons were clearly coordinated between the left and right metathoracic hemiganglia and also between the mesothoracic and the ipsilateral metathoracic ganglia. These data provide clear evidence for centrally generated interlimb coordination in an insect.

Item Type:Article
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URLURL TypeDescription CentralArticle
Laurent, Gilles0000-0002-2296-114X
Additional Information:© 1996 Society for Neuroscience. Received May 15, 1996; revised Aug. 27, 1996; accepted Sept. 20, 1996. This research was supported by a National Research Service Award Postdoctoral Fellowship to A.B. and a National Science Foundation Presidential Faculty Fellowship to G.L. We thank two anonymous reviewers for helpful comments.
Funding AgencyGrant Number
NIH Postdoctoral FellowshipUNSPECIFIED
Subject Keywords:scratching; motor control; insect; thoracic; ganglia; CPG; locomotion
Issue or Number:24
PubMed Central ID:PMC6579234
Record Number:CaltechAUTHORS:20191030-152214045
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Official Citation:Central Generation of Grooming Motor Patterns and Interlimb Coordination in Locusts. Ari Berkowitz, Gilles Laurent. Journal of Neuroscience 15 December 1996, 16 (24) 8079-8091; DOI: 10.1523/JNEUROSCI.16-24-08079.1996
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99567
Deposited By: Tony Diaz
Deposited On:30 Oct 2019 22:27
Last Modified:17 Feb 2022 00:20

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