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Journal of Experimental Biology 52,667-673 (1970)
Published by Company of Biologists 1970

Activity in the Locust Nerve Cord in Response to Wing-Nerve Stimulation

ERIK GETTRUP ¹

¹ Department of Zoology and Department of Molecular Biology, University of California, Berkeley; Institute of Neurophysiology, University of Copenhagen.

1. Nerve cord activity in response to repetitive stimulation of wing nerves 1C₁ and 1D was investigated in preparations of locusts. Firings of single central units occurred at latencies defined with an accuracy of few milliseconds. Various recordings of latencies show that it is not possible to exclude ganglionic synapses within the pathways considered.

2. Records from the connectives anterior to the mesothoracic ganglion or from the abdominal connectives show an increase in activity during repetitive stimulation. When recorded between prothoracic and mesothoracic ganglia a response was found in ipsilateral as well as contralateral connectives.

3. The ipsilateral and contralateral responses were delayed differently with respect to the stimulus. When nerve 1C₁ of metathorax was activated the ipsilateral delay amounted to 7 msec., s.d. 2 msec., whereas the contralateral delay was found to be 8 msec., s.d. 3.4 msec. Ipsi- and contralateral latencies during stimulation of 1D of the metathorax were 5 msec., s.d. 1.4 msec.