The central connections and actions during walking of tibial campaniform sensilla in the locust
The central connections and actions during walking of tibial campaniform sensilla in the locust
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DOI：
10.1007/bf00225823
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发表时间：
1996-06-01
期刊：
影响因子：
--
通讯作者：
Emptage, NJ
中科院分区：
文献类型：
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作者：
Newland, PL;Emptage, NJ
作用于昆虫外骨骼的应变是由钟状感器监测的。在蝗虫中胸腿的胫骨上，近背表面有三组钟状感器。本研究分析了钟状感器的传入与胫屈肌运动神经元的直接兴奋性联系，以及钟状感器的传入与中枢神经元的联系和它们在行走过程中的作用。他们还作出直接的连接与特定的尖峰本地interneurons作出直接的抑制输出连接与缓慢的伸肌tibal运动neurone.During行走伸展运动的tibal在立场产生纵向张力的胫骨背上的峰值在中期立场之前返回到零之前摆动。这种张力的下降可以激活钟状感器。反过来，这将导致伸肌胫前肌运动神经元的抑制和屈肌胫前肌运动神经元的兴奋。因此，这有助于从站姿到挥杆的过渡。在旋转运动中，胫骨弯曲，背侧表面受压。这也可以激活一些钟状感器，其对屈肌运动神经元的作用将加强胫骨的屈曲。
Strain acting on the exoskeleton of insects is monitored by campaniform sensilla. On the tibia of a mesothoracic leg of the locust (Schistocerca gregaria) there are three groups of campaniform sensilla on the proximo-dorsal surface. This study analyses the responses of the afferents from one group, their connections with central neurones and their actions during walking.The afferents of the campaniform sensilla make direct excitatory connections with flexor tibiae motor neurones. They also make direct connections with particular spiking local interneurones that make direct inhibitory output connections with the slow extensor tibiae motor neurone.During walking extension movements of the tibiae during stance produce longitudinal tensile forces on the dorsal tibia that peak during mid stance before returning to zero prior to swing. This decline in tension can activate the campaniform sensilla. In turn this would lead to an inhibition of the extensor tibiae motor neurone and an excitation of the flexor tibiae motor neurones. This, therefore, aids the transition from stance to swing. During turning movements, the tibia is flexed and the dorsal surface is put under compression. This can also activate some of campaniform sensilla whose effect on the flexor motor neurones will reinforce the flexion of the tibia.