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Intracellular recording from vertebrate myelinated axons: mechanism of the depolarizing afterpotential

1. Electrophysiological techniques are described which allow intracellular recording from peripheral myelinated axons of lizards and frogs for up to several hours. The sciatic and intramuscular axons studied here have resting potentials of ‐60 to ‐80 mV and action potentials (evoked by stimulation of the proximal nerve trunk) of 50‐90 mV. They show a prominent depolarizing afterpotential (d.a.p.), which is present both in isolated axons and in axons still attached to their peripheral terminals. This d.a.p. has a peak amplitude of 5‐20 mV at the resting potential, and decays with a half‐time of 20‐100 msec.