神経筋肉接続部に於ける興奮伝導(蛙)の季節的変動について(I)

抄録

Studies were carried out by means of the Kuhne's M. gracilis method every day from Oct.1950 to Sep.1951. There were four fundamental conduction systems of excitation upon the neuro-muscular junction of frog, e. g. typical isodromical system (reciprocal conduction), atypical isodromical system, heterodromical system (irreciprocal conduction) and apparently non-conducting system. However, there was seasonal variation in conduction system. During a certain period from July to February, isodromical conduction system was the most dominant. On the other hand, during another period from March to June apparently non-conductig system andheterodromical systems were dominant. Anyhow, these four fundamental systems conduction were reversible under certain condition e. g. administration of adrenaline.