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The central connections and actions during walking of tibial campaniform sensilla in the locust

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Abstract

Strain acting on the exoskeleton of insects is monitored by campaniform sensilla. On the tibia of a mesothoracic leg of the locust (Schistocerca gregaria) there are three groups of campaniform sensilla on the proximo-dorsal surface. This study analyses the responses of the afferents from one group, their connections with central neurones and their actions during walking.

The afferents of the campaniform sensilla make direct excitatory connections with flexor tibiae motor neurones. They also make direct connections with particular spiking local interneurones that make direct inhibitory output connections with the slow extensor tibiae motor neurone.

During walking extension movements of the tibiae during stance produce longitudinal tensile forces on the dorsal tibia that peak during mid stance before returning to zero prior to swing. This decline in tension can activate the campaniform sensilla. In turn this would lead to an inhibition of the extensor tibiae motor neurone and an excitation of the flexor tibiae motor neurones. This, therefore, aids the transition from stance to swing. During turning movements, the tibia is flexed and the dorsal surface is put under compression. This can also activate some of campaniform sensilla whose effect on the flexor motor neurones will reinforce the flexion of the tibia.

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Author notes

  1. N. J. Emptage

    Present address: National Institute for Medical Research, The Ridgeway, NW7 1AA, Mill Hill, London, UK

Authors and Affiliations

  1. Department of Zoology, University of Cambridge, Downing Street, CB2 3EJ, Cambridge, UK

    P. L. Newland & N. J. Emptage

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  1. P. L. Newland
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Newland, P.L., Emptage, N.J. The central connections and actions during walking of tibial campaniform sensilla in the locust. J Comp Physiol A 178, 749–762 (1996). https://doi.org/10.1007/BF00225823

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