Studies on the electric excitability of the adductor muscle of glochidia

Lábos, Elemér (1964) Studies on the electric excitability of the adductor muscle of glochidia. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 31. pp. 27-37. ISSN 0365-3005

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Abstract

In this work the electric excitability of the adductor of glochidia of freshwater mussel (Anodonta cygnea L.) was investigated. The reciprocal cosinus relation between excitability and direction of electric field as established by Rushton , holds true approximately also in these experiments. The threshold obtained at impulses of 5 msec duration running parallel with muscle fibres was 3.5 V. Threshold voltage is approximately doubled and the transversal threshold becomes very high when increasing the angle to 60°-65°. Up to 65° chronaxie was about constant i.e. 1 msec. The possibility of a hypothetical motor innervation is discussed on basis of secondary changes in the relation between threshold voltage and duration, and of other results deviating from the findings of Rushton.

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