Abstract
Oviductal contractions and the control of oviposition were investigated in vivo and in vitro in Gryllus bimaculatus females. In vivo experiments showed that oviposition is controlled nervously by both the brain and the last abdominal ganglion, and that one or more neurohormones cause ovipositor movements and abdominal contractions. In vitro, the assay of nerve ganglia and corpora cardiaca extracts on the isolated oviduct showed that they markedly increase the frequency of oviductal contractions. However, the action of thoracic ganglia extracts varies according to a circadian cycle. This observation, combined with the finding that the effects of the corpora cardiaca differ from those of the brain, suggests that each of these organs contains distinct neurohormones. None of the neurotransmitters tested was as potent as brain or ganglia extracts, although octopamine, l-glutamate and proctolin do stimulate oviductal contractions at low concentrations.
Published Version
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