Josephson R K, Stokes D R, Chen V
J Exp Zool. 1975 Sep;193(3):281-300. doi: 10.1002/jez.1401930305.
The wing muscles used in singing by the katydid, Neoconocephalus robustus, are extraordinarily fast. At 35 degrees C, the animal's thoracic temperature during singing, an isometric twitch lasts only five to eight msec (onset to 50% relaxation) and the fusion frequency of these muscles is greater than 400 Hz. Stimulating the motornerve to a singing muscle initiates a short (2.5 msec at 35 degrees C), sometimes overshooting depolarization of the muscle fibers. Despite their spike-like appearance, the electrical responses are largely synaptic potentials. The muscle membrane appears to be capable of only weak, electrically-excitable, depolarizing electrogenesis. The short synaptic potentials result in part from rapidly-developing delayed rectification, in part from a low resting membrane resistance (Rm = 162 omega cm2) and a concomitantly short membrane time constant (about 1.5 msec).
在歌唱时，强壮新康蜉蝣（Neoconocephalus robustus）使用的翅膀肌肉速度极快。在35摄氏度（该动物歌唱时的胸腔温度）下，等长收缩的抽搐仅持续5至8毫秒（从开始到50%松弛），并且这些肌肉的融合频率大于400赫兹。刺激歌唱肌肉的运动神经会引发短暂的（在35摄氏度下为2.5毫秒）、有时会超射的肌肉纤维去极化。尽管它们的电反应呈尖峰状，但主要是突触电位。肌肉膜似乎仅能产生微弱的、电兴奋性的去极化电活动。短暂的突触电位部分源于快速发展的延迟整流，部分源于低静息膜电阻（Rm = 162欧姆·平方厘米）以及随之而来的短膜时间常数（约1.5毫秒）。
