ACTION POTENTIALS FROM SKELETAL MUSCLE

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Abstract
Action potentials were recorded from frog sartorius muscles by the cathode ray oscillograph, using high sensitivity and stimulating only a few fibers. When electrodes are exactly upon active fibers, the process conducted past each electrode appears to be triphasic; when off this pathway, each process appears to bemonophasic. Each triphasic record can be interpreted as the algebraic sum of single "phases" in opposite directions. One is due to the active depolarization process under the electrode, the other to currents flowing from an active region, through the cores of the fibers, and returning through inactive ones which shunt the active ones. The results indicate that the conditions for obtaining such triphasic records are that an active fiber be asymmetrically shunted. The form of this potential is consistent with the core conductor-membrane theory of muscle and nerve and follows as a direct consequence of its fundamental assumptions.

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