Antennal motor activity induced by pilocarpine in the American cockroach |
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Authors: | Jiro Okada Yusuke Morimoto Yoshihiro Toh |
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Institution: | (1) Department of Biology, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581, Japan;(2) Present address: Faculty of Environmental Studies, Nagasaki University, Nagasaki 852-8521, Japan |
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Abstract: | The antennal motor system is activated by the muscarinic agonist pilocarpine in the American cockroach Periplaneta americana, and its output patterns were examined both in restrained intact animals and in isolated CNS preparations. The three-dimensional
antennal movements induced by the hemocoelic drug injection were analyzed in in vivo preparations. Pilocarpine effectively
induced prolonged rhythmic movements of both antennae. The antennae tended to describe a spatially patterned trajectory, forming
loops or the symbol of infinity (∞). Such spatial regularity is comparable to that during spontaneous tethered-walking. Rhythmic
bursting activities of the antennal motor nerves in in vitro preparations were also elicited by bath application of pilocarpine.
Cross-correlation analyses of the bursting spike activities revealed significant couplings among certain motor units, implying
the spatial regularity of the antennal trajectory. The pilocarpine-induced rhythmic activity of antennal motor nerves was
effectively suppressed by the muscarinic antagonist atropine. These results indicate that the activation of the antennal motor
system is mediated by muscarinic receptors. |
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Keywords: | Insect Antenna Motor system Muscarinic Pilocarpine |
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