Cambarus clarkiiに於ける遅神経の刺激と開筋の反応

概要

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We studied the contraction evoked by the stimulation of the slow fibre of the abductor muscle in Cabarurs clarkii. The following results were obtained. 1. The contraction of the abductor muscle could not be evoked by a single stimulation, but the excitability of the myoneural junction in this muscle increased by the arrival of an impulse. The eleva-tion of the excitability of the myoneural junction continued for 392 msec. During this time, if the second impulse arrived at the myoneural junction there occured the facillitation, and the muscle contraction oc-cured. The potentiation ofthe end plate potential caused by the second impulse was recognized. 2) The relation between the voltage and the response time (msec) was hyperbolic as shown in fig. 2. Weiss' formula was valid for the experimental results. The following experimental formula was obtained V=0.368+0.473/t Here, V is the voltage of the rectangular puls, and means the response time. 3) If the duration and strength of the rectangular puls was adequate, the contraction of the abductor muscle could be evoked by the single applied on the slow fibre. In this case two impulses, one caused by the cathodal make stimulation and the other by the anodal break stimulation, successively propagated along the slow fibre and the successive two arrivals of the impulses at the myoneural junction caused the patentiation of the end piate potential.
社団法人日本動物学会の論文
1958-03-15