Vodusek D B, Janko M
University Institute of Clinical Neurophysiology, University Medical Centre, Ljubljana, Yugoslavia.
Brain. 1990 Jun;113 ( Pt 3):813-20. doi: 10.1093/brain/113.3.813.
Reflex latency variability was established for single motor neuron discharges in the bulbocavernosus reflex, as elicited by electrical stimuli to the dorsal penile nerve and recorded by a single fibre EMG electrode in the bulbocavernosus muscle. Whereas many reflex responses had a rather large latency variability of above 1000 microseconds (expressed as SD of mean latency) there was a group of motor neurons with a variability of around 500 microseconds. Single motor neuron reflex responses with shorter latencies tended to show less variability. No habituation of single motor neuron reflex discharges was observed on prolonged regular repetitive stimulation. Both absence of habituation and the relatively low latency variability of bulbocavernosus reflex responses for single motor neurons suggest similarities between this reflex and the first component of the blink reflex; we postulate that the shortest bulbocavernosus reflex pathway is oligosynaptic.
通过对阴茎背神经进行电刺激并在球海绵体肌中用单纤维肌电图电极记录，确定了球海绵体反射中单个运动神经元放电的反射潜伏期变异性。虽然许多反射反应的潜伏期变异性相当大，超过1000微秒（以平均潜伏期的标准差表示），但有一组运动神经元的变异性约为500微秒。潜伏期较短的单个运动神经元反射反应往往变异性较小。在长时间定期重复刺激下，未观察到单个运动神经元反射放电的习惯化现象。单个运动神经元球海绵体反射反应不存在习惯化以及相对较低的潜伏期变异性，这两者都表明该反射与瞬目反射的第一成分之间存在相似性；我们推测最短的球海绵体反射通路是少突触的。
