Contributions of structure and innervation pattern of the stick insect extensor tibiae muscle to the filter characteristics of the muscle-joint system
Contributions of structure and innervation pattern of the stick insect extensor tibiae muscle to the filter characteristics of the muscle-joint system
复制标题
竹节虫胫骨伸肌的结构和神经支配模式对肌肉关节系统过滤特性的贡献
DOI：
--
复制
发表时间：
1996
影响因子：
2.8
通讯作者：
W. Stein
中科院分区：
文献类型：
--
作者：
U. Bässler;W. Stein
结果表明，竹节虫Cuniculinaimigra股骨-胫骨关节的肌肉-关节系统的低通滤波特性是由伸肌和屈肌共同收缩引起的。伸肌的最远端区域包含高百分比的慢肌纤维，参与这种共同收缩。这一结论是由下列证据得出的。(1)惯性力和摩擦力不影响肌肉-关节系统的低通滤波器的特性。(2)在高刺激频率下，股弦音器官的正弦刺激期间，伸肌和屈肌有一些共同收缩。这两种肌肉都产生随着刺激频率增加而增加的强直力，并且从刺激开始直到达到平台期随时间增加。(3)对于伸肌，这种紧张力仅由其最远端部分产生。(4)电刺激共同的抑制性运动神经元（CI 1）减少了在伸肌的最远端部分产生的紧张力。因此，CI 1刺激降低了胫骨运动的幅度，以响应在低于0.5 Hz的刺激频率下对股弦音器官的正弦刺激（在该频率范围内，胫骨运动幅度是由整个伸肌产生的力幅度的函数，并且不存在共同收缩），但是在1Hz及以上的弦音器官刺激频率下，CI 1刺激增加胫骨运动幅度（在这种情况下，运动幅度受到伸肌和屈肌共同收缩程度的限制）。随着在较高刺激频率下重复弦音器官刺激，胫骨运动幅度稳步降低。这一定是伸肌和屈肌的共同收缩水平增加的结果，因为在低刺激频率（没有共同收缩）下，在重复刺激期间运动幅度没有降低。它的结论是，共同收缩的伸肌和屈肌胫前肌，防止不稳定的反射回路，尽管高增益所需的生成僵住症。因此，所描述的机制可以被认为是对这种动物所占据的生态位的适应。在主动运动期间，可以通过CI 1关闭伸肌远端部分对该系统的贡献。
It is shown that the low-pass filter characteristics of the musclejoint system of the femurtibia joint of the stick insect Cuniculina impigra result from co-contraction of the extensor and flexor tibiae muscles. The most distal region of the extensor muscle, which contains a high percentage of slow muscle fibres, is involved in this co-contraction. This conclusion results from the following evidence. (1) Inertial and friction forces do not affect the characteristics of the low-pass filter of the musclejoint system. (2) There is some co-contraction of the extensor and flexor muscles during sinusoidal stimulation of the femoral chordotonal organ at high stimulus frequencies. Both muscles generate tonic forces that increase with increasing stimulus frequency and also increase with time from the beginning of stimulation until a plateau is reached. (3) For the extensor muscle, this tonic force is produced by its most distal portion only. (4) Electrical stimulation of the common inhibitory motoneurone (CI1) reduces the tonic force generated in this most distal portion of the extensor muscle. Therefore, CI1 stimulation reduces the amplitude of tibial movement in response to sinusoidal stimulation of the femoral chordotonal organ at stimulus frequencies below 0.5 Hz (over this frequency range, the tibial movement amplitude is a function of the force amplitude produced by the whole extensor muscle and there is no co-contraction), but at chordotonal organ stimulus frequencies of 1 Hz and above, CI1 stimulation increases the tibial movement amplitude (in this case, movement amplitude is limited by the degree of co-contraction of the extensor and flexor muscles). With repeated chordotonal organ stimulation at higher stimulus frequencies, the tibial movement amplitude steadily decreases. This must be a consequence of increasing levels of co-contraction of the extensor and flexor muscles, since at low stimulus frequencies (no co-contraction) there is no reduction in movement amplitude during repeated stimulations. It is concluded that co-contraction of the extensor and flexor tibiae muscles prevents instability in the reflex loop in spite of the high gain necessary for the generation of catalepsy. Therefore, the mechanism described can be considered to be an adaptation to the ecological niche occupied by this animal. The contribution of the distal part of the extensor muscle to this system can be switched off by the CI1 during active movements.
蝗虫局部反射通路中机械感觉信号的处理。
DOI：
10.1242/jeb.146.1.209
发表时间：
1989
期刊：
The Journal of experimental biology
影响因子：
--
作者：
Burrows,M
通讯作者：
Burrows,M