膀胱外括約筋の筋電図に関する研究 第3報: 膀胱外括約筋の筋電図に影響をおよぼす因子についての動物実験成績

Abstract

Several factors affecting EMG of bulbocavernosus muscle were studied on male rabbit. Affecting factors such as tensions of the bladder wall induced by variable pressures exerted on the bladder, rhythmic activity of the urinary bladder, electric stimulation of the pelvic nerve and the hypogastric nerve and stimulations to different portions of the bladder mucosa were studied by means of EMG of the bulbocavernosus muscle. EMG of vas deferens was also studied by occasion of electric stimulation of the pelvic nerve and the hypogastric nerve. The following results were obtained. (1) The activity of bulbocavernosus muscle had the closest relation to the tension of the 'bladder wall but had no relation to the rhythmic activity of the bladder itself. (2) Electric stimulations of the pelvic nerve as well as the hypogastric nerve revealed inhibiting effects on the activity of the bulbocavernosus muscle. This inhibiting effects were much more prominent in electric stimulation of the hypogastric nerve than that of the pelvic nerve. But no complete inhibition was seen in contraction of bulbocavernosus muscle produced by bulbocavernosus reflex. (3) Stimulations on the mucosa of the bladder neck produced prompt and effective contractions of the bulbocavernosus muscle reflectively. (4) Reactive spike discharge in EMG of bulbocavernosus muscle was brought immediately "after the electric stimulation on the glans penis. But there was a latent time between the reactive spike discharge in EMG of bulbocavernosus muscle and the electric stimulation on the mucosa of the bladder neck.