ACTIVITY AND DIRECTIONAL SENSITIVITY OF LEG CAMPANIFORM SENSILLA IN A STICK INSECT
ACTIVITY AND DIRECTIONAL SENSITIVITY OF LEG CAMPANIFORM SENSILLA IN A STICK INSECT
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DOI：
10.1007/bf00217109
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发表时间：
1991-01-01
期刊：
影响因子：
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通讯作者：
DELCOMYN, F
中科院分区：
文献类型：
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作者：
DELCOMYN, F
1.对昆虫腿上成群排列的机械感受性钟形感受器进行了研究。在中后腿，最后转子钟状组(组1)的定位是为了受到作用于粗隆后关节与髋关节的压缩表皮力的刺激。支配这个钟状群的神经TR2的记录证实，感受器在方向上对股骨施加的或主动的运动产生的角质应力敏感。不同的感受器有不同的反应阈值，但所有感受器对给定刺激的反应方式是相同的。股骨粗隆相对于髋关节的后向水平偏转(与正常运动平面成直角)对第一组感受器产生强烈的兴奋。向前的水平偏转导致群体中正在进行的背景活动急剧减少。股骨的垂直运动通常对钟状感受器的活动几乎没有影响。动物对股骨粗隆的主动压抑与压抑运动的强度成正比地减少了正在进行的背景活动。模拟肌肉产生的腿部提举的海拔高度强烈地增加了活动量。结论：钟状组1在小腿粗隆-髋关节周围发出被动水平和主动垂直运动的信号。这种双重反应模式意味着，动物在没有肌肉活动信息的情况下，无法解释来自钟状群体的信号。
1. The mechanoreceptive campaniform sensilla, which are arranged in groups on insect legs, were studied in the stick insect Cuniculina impigra. In middle and rear legs, the most posterior trochanteral campaniform group (group 1) is oriented so as to be stimulated by compressional cuticular forces acting on the posterior articulation of the trochanter with the coxa.2. Recordings from nerve Tr2, which innervates this campaniform group, confirmed that the sensilla were directionally sensitive to cuticular stress generated by imposed or active movements of the femur. Different individual sensilla had different thresholds of response, but all responded qualitatively in the same way to a given stimulus.3. Posteriorward horizontal deflection of the femurtrochanter relative to the coxa (at right angles to the normal plane of movement) produced a strong excitation of the group 1 sensilla. Anteriorward horizontal deflection caused a sharp reduction of on-going background activity in the group. Imposed vertical movements of the femur usually had little effect on the activity of the campaniform sensilla.4. Active depression of the femur-trochanter by the animal reduced on-going background activity in proportion to the strength of the depression movement. Elevation that simulated muscle-generated lifting of the leg strongly increased activity.5. It is concluded that campaniform group 1 functions to signal passive horizontal and active vertical movements around the trochantero-coxal joint of the leg. This dual pattern of response means that the animal cannot interpret signals from this campaniform group without also having information about muscle activity.