From a standpoint of conduction of excitation and its direction, the livingsystems can be classified into three fundamental conduction systems of excitation (“Typical Isodromical System,”Atypical Isodromical System and “Heterodromical System”). The another verified in the previous report that this fundamental conduction systems of excitation were demonstrated in the conduction of excitation between the atrium and ventricle.
In this paper, it has been verified on the neur o muscular junction whether the above fact is applicable to livingsystems besides atrioventricular aspect.
Method: -Kühnés M. Gracilis method was followed.
Result: -The conduction of excitation upon the n euromuscular junction showed an irreciprocal conduction of excitation under the normal condition, but showed a reciprocal condition (e. g. whith Adrenaline-Ringers solution). The latter conduction changed into an irreciprocal conduction following a change in the conduction (e. g. was used instead of Adrenaline-Ringer's solution).
It was verified that the three fundamental conduction systems of excitation were reversible serially. The results were the same with coduction of excitation in which a septum was the only bridge between the atrium ventricle.
Accordingly the results do not a gree with the so far accepted maintenance that the conduction upon the neuromuscular junction is irreciprocal.
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