Morphological and electrophysiological characteristics of the epipharyngeal sensilla of the silkworm, Bombyx mori |
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| Authors: | K. Asaoka and T. Shibuya |
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| Affiliation: | (1) National Institute of Sericultural and Entomological Science, Ohwashi 1-2, 305 Tsukuba, Ibaraki, Japan;(2) Institute of Biological Sciences, University of Tsukuba, 305 Tsukuba, Ibaraki, Japan;(3) Present address: Science Laboratory for Olfaction and Taste, 302 HORI Bldg. 488-18 Sanuki, 301 Ryugasaki, Ibaraki, Japan |
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| Abstract: | One pair of gustatory sensilla was found on the epipharynx ofBombyx mori larvae, and some morphological and electrophysiological characteristics of the epipharyngeal sensilla were investigated. They are sensilla coeloconica composed of a small papilla with a pore at the tip and a swelling of cuticle encircling the papilla. Three bipolar neurons innervate each sensillum. One neuron is an inositol receptor which responds to inositol only. Another cell responds with action potentials of relatively large amplitude to some feeding deterrent substances, such as strychnine nitrate. The thresholds of these cells for inositol and strychnine nitrate are approximately 10−4 M and 10−7 M, respectively. At least two kinds of spikes can be observed when these sensilla are stimulated with some salts and acids. Dose-response relationships and time courses of responses to inositol and strychnine nitrate were also examined in this study. |
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| Keywords: | epipharyngeal sensilla contact chemoreception electrophysiology Lepidoptera Bombyx mori |
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