Antidromic Inhibition Accompanied by Ventral Root Positivities

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Science  21 Feb 1964:
Vol. 143, Issue 3608, pp. 824-825
DOI: 10.1126/science.143.3608.824


Ventral-root positivities exhibiting the time course of antidromic inhibition were recorded in the cat. Hyperpolarization of the motoneuron occurs concomitant to antidromic inhibitionwithout damage to the motoneuron. Under optimal conditions L7 and S1 ventral-root filaments show electrotonic potentials of positive sign with the time course of antidromic inhibition. Conditions predisposing to membrane depolarization are not responsible for this hyperpolarization. Antidromic inhibition was not found in roots caudal to S1.