Neural mechanism for generating and switching motor patterns of rhythmic movements of ovipositor valves in the cricket

Ogawa, Hiroto; Kagaya, Katsushi; Saito, Mitsuo; Yamaguchi, Tsuneo

Neural mechanism for generating and switching motor patterns of rhythmic movements of ovipositor valves in the cricket

Ogawa, Hiroto; Kagaya, Katsushi; Saito, Mitsuo et al.

Journal of Insect Physiology, 2011, 57(2), 326-338

Permalink : https://hdl.handle.net/2115/47376

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アクセス権	open access
URI	https://hdl.handle.net/2115/47376
タイトル	Neural mechanism for generating and switching motor patterns of rhythmic movements of ovipositor valves in the cricket
著者	Ogawa, Hiroto ; Kagaya, Katsushi ; Saito, Mitsuo ; Yamaguchi, Tsuneo
e-Rad_Researcher 70301463 著者名 Ogawa, Hiroto
著者名 Kagaya, Katsushi
著者名 Saito, Mitsuo
著者名 Yamaguchi, Tsuneo
言語	英語
キーワード	Ovipositor
	Motor pattern
	Central pattern generator
	Interneuron
	Proprioceptor
	Cricket
発行日	2011-02
出版者	Elsevier
収録物名	Journal of Insect Physiology
巻(号)	57(2)
ページ	326-338
抄録	In adult female crickets (Gryllus bimaculatus), rhythmic movements of ovipositor valves are produced by contractions of a set of ovipositor muscles that mediate egg-laying behavior. Recordings from implanted wire electrodes in the ovipositor muscles of freely-moving crickets revealed sequential changes in the temporal pattern of motor activity that corresponded to shifts between behavioral steps: penetration of the ovipositor into a substrate, deposition of eggs, and withdrawal of the ovipositor from the substrate. We aimed in this study to illustrate the neuronal organization producing these motor patterns and the pattern-switching mechanism during the behavioral sequence. Firstly, we obtained intracellular recordings in tethered preparations, and identified 12 types of interneurons that were involved in the rhythmic activity of the ovipositor muscles. These interneurons fell into two classes: 'initiator interneurons' in which excitation preceded the rhythmic contractions of ovipositor muscles, and 'oscillator interneurons' in which the rhythmic oscillation and spike bursting occurred in sync with the oviposition motor rhythm. One of the oscillator interneurons exhibited different depolarization patterns in the penetration and deposition motor rhythms. It is likely that some of the oscillator interneurons are involved in producing different oviposition motor patterns. Secondly, we analyzed oviposition motor patterns when the mecahnosensory hairs located on the inside surface of the dorsal ovipositor valves were removed. In deafferented preparations, the sequential change from deposition to withdrawal did not occur. Therefore, the switching from deposition pattern to withdrawal pattern is signaled by the hair sensilla that detect the passage of an egg just before it is expelled.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0022-1910
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.jinsphys.2010.11.021