Properties of antennal mechano receptors in Ligia exotica

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タイトル別名
  • Properties of antennal mechano receptor
  • フナムシ触角の機械受容器の性質

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Antennal joint receptors of carpus-flagella joint (C - F joint) and f lagellar contact receptor of Ligia exotica were studied. Movable range of each antennal joint was obsered and nerve responses to C-F joint movement were recorded. The nerve responses to joint movement were classified to two type responses; one is tonic type response which continued firing as joint flexion, second is phasic type which showed fast adaptation. Almost of units (about 90%) responded with increase of firing to flexion but few units showed inhibition. Firing rate of the tonic type response depended on angle of the joint and, to a sustained flexion, the firing remained with steady rate depending on the angle. These tonic type receptors coded a joint position information. The phasic type receptor responded to a joint movement and a single cell responded to movement of only one direction (unidirectional) , a flexion or an extension. Notwithstanding of steady rate of angular movement, the firing frequency reached maximum immediately after the initiation of the movement and rapidly adapted. Firing rate of these phasic unit depend on movement velocity. This phasic type response coded a movement direction and a rate. Unnatural opposite directional movement or lateral movement of the C - F joint which an animal cannot move itself caused also nerve responses. So it is suggested that these receptors have a rule not only as proprioceptors but also as extraceptors. Contact atimuli to the surface of flagellum caused nerve responses which seemed to be originated from tricorn like sensilla, indicating important rule for searching.

source:Bulletin of the Faculty of Education, Chiba University. Part II

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