Physiological properties of afferents from tactile hairs on the hindlegs of the locust.
Physiological properties of afferents from tactile hairs on the hindlegs of the locust.
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DOI：
10.1242/jeb.155.1.487
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
P. L. Newland
中科院分区：
文献类型：
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作者：
P. L. Newland
1. 描述了蝗虫后腿触毛及其感觉传入神经的空间分布和生理特性。动物之间毛发的位置是一致的。胫骨背部的毛发平均长度为403.1 +/- 17.9微米，比胫骨腹侧的毛发（265.2 +/- 10.44微米）更长。股骨背侧和腹侧的毛发约310微米长，跗骨上的毛发较短，约200微米。2. 根据对正弦机械刺激的阈值反应，触觉毛有两种基本的生理类型。高阈毛只出现在胫骨近背侧和每根胫骨近基部，而低阈毛出现在股骨、胫骨和跗骨上。3. 高阈值毛发传入对毛干施加的偏转有相位响应，平均速度阈值为21.1 +/- 4.2度s-1。它们在5赫兹的频率下仅需11次循环，就能迅速适应重复刺激。低阈值毛发对施加的偏转以更相张力的方式作出反应，其速度阈值小于3度s-1。它们适应重复刺激的速度与高阈值毛发相似，但在5hz的200次循环后仍会对刺激做出反应。所有毛发方向敏感，优选方向为近端和中端（即近端和朝向身体）；它们对相反方向的偏转最不敏感。
1. The spatial distribution and physiological properties of the tactile hairs and their sensory afferents of the hindlegs of the locust Schistocerca gregaria are described. Hairs occur in a consistent position from animal to animal. Hairs on the dorsal tibia are of a greater mean length, 403.1 +/- 17.9 microns, than hairs on the ventral tibia, 265.2 +/- 10.44 microns. Hairs on the dorsal and ventral femur are approximately 310 microns long and hairs on the tarsus are shorter, approximately 200 microns. 2. Based on their threshold responses to sinusoidal mechanical stimulation, the tactile hairs are of two basic physiological types. High-threshold hairs occur only on the proximal dorsal tibia and at the proximal base of each tibial spine, whereas low-threshold hairs are found on the femur, tibia and tarsus. 3. High-threshold hair afferents respond phasically to imposed deflections of the hair shaft and have mean velocity thresholds of 21.1 +/- 4.2 degrees s-1. They adapt rapidly to repetitive stimulation, after as few as 11 cycles at 5 Hz. Low-threshold hairs respond in a more phaso-tonic manner to imposed deflections and have velocity thresholds of less than 3 degrees s-1. They adapt to repetitive stimulation at a similar rate to the high-threshold hairs, but continue to respond to stimulation after 200 cycles at 5 Hz. 4. All the hairs are directionally sensitive, with the preferred direction being oriented proximally and medially (i.e. proximally and towards the body); they are least sensitive to deflections in the opposite direction.