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Effects of neck and circumoesophageal connective lesions on posture and locomotion in the cockroach

Journal of Comparative Physiology A volume 191, pages 559–573 (2005)Cite this article

Abstract

Few studies in arthropods have documented to what extent local control centers in the thorax can support locomotion in absence of inputs from head ganglia. Posture, walking, and leg motor activity was examined in cockroaches with lesions of neck or circumoesophageal connectives. Early in recovery, cockroaches with neck lesions had hyper-extended postures and did not walk. After recovery, posture was less hyper-extended and animals initiated slow leg movements for multiple cycles. Neck lesioned individuals showed an increase in walking after injection of either octopamine or pilocarpine. The phase of leg movement between segments was reduced in neck lesioned cockroaches from that seen in intact animals, while phases in the same segment remained constant. Neither octopamine nor pilocarpine initiated changes in coordination between segments in neck lesioned individuals. Animals with lesions of the circumoesophageal connectives had postures similar to intact individuals but walked in a tripod gait for extended periods of time. Changes in activity of slow tibial extensor and coxal depressor motor neurons and concomitant changes in leg joint angles were present after the lesions. This suggests that thoracic circuits are sufficient to produce leg movements but coordinated walking with normal motor patterns requires descending input from head ganglia.

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Abbreviations

SOG:

Suboesophageal ganglion

NL:

Neck connective lesion

CoCL:

Circumoesophageal connective lesion

Ds:

Slow depressor of the trochanter motor neuron

SETi:

Slow extensor of the tibia motor neuron

Fti:

Femur- tibia joint

CTr:

Coxa- trochanter joint

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Acknowledgements

Special thanks to S.N. Zill and A.J. Pollack for their advice and help on this project. We would also like to thank Dr. Mark Willis and two anonymous reviewers for helpful comments on the manuscript. This work was supported by NIH Grant NRSA F32-NS43004 to ALR and Eglin AFB Grant F08630-01-C-0023 to RER.

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  1. Department of Biology, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106-7080, USA

    Angela L. Ridgel & Roy E. Ritzmann

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  1. Angela L. Ridgel
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  2. Roy E. Ritzmann
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Correspondence to Angela L. Ridgel.

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Ridgel, A.L., Ritzmann, R.E. Effects of neck and circumoesophageal connective lesions on posture and locomotion in the cockroach. J Comp Physiol A 191, 559–573 (2005). https://doi.org/10.1007/s00359-005-0621-0

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  • DOI: https://doi.org/10.1007/s00359-005-0621-0

Keywords

  • Brain
  • Suboesophageal ganglion
  • Walking
  • Arthropod
  • Descending control