Hoyle G, Field L H
J Neurobiol. 1983 Jul;14(4):299-312. doi: 10.1002/neu.480140405.
Sustained steady contractural or catchlike tension (CT) occurs in the metathoracic extensor tibiae muscle of the primitive insect the weta (Orthoptera: Stenopelmatidae) during its characteristic leg-extension defense behavior or following leg-position conditioning. Similar action occurs occasionally in semi-intact preparations and is abruptly turned off by a single peripheral inhibitory impulse. These phenomena were reproduced routinely by first infusing saline containing 10(-8) M (or stronger) octopamine into the muscle for 12 min, and then stimulating the slow excitatory motor neuron SETi with a brief burst. Direct stimulation of the dorsal unpaired median neuron, innervating the extensor tibiae (DUMETi) prior to SETi stimulation, also led to CT. Both octopamine and DUMETi markedly enhanced the tension developed in response to a burst of impulses in SETi.
在原始昆虫沙螽（直翅目：蟋螽科）的特征性腿部伸展防御行为期间或腿部位置条件反射后，其后胸胫节伸肌会出现持续稳定的收缩性或类似捕捉的张力（CT）。类似的作用偶尔也会在半完整标本中出现，并且会被单个外周抑制性冲动突然消除。这些现象可通过以下方式常规再现：首先将含有10⁻⁸ M（或更强）章鱼胺的生理盐水注入肌肉12分钟，然后用短暂的爆发刺激慢兴奋性运动神经元SETi。在刺激SETi之前，直接刺激支配胫节伸肌的背侧无对正中神经元（DUMETi）也会导致CT。章鱼胺和DUMETi均显著增强了对SETi中一阵冲动产生的张力。
