Figure 1.

Intracellular PD axon recordings from peripheral nerve. A, Intracellular recordings of the PD soma and axon along with extracellular recording from the pdn during ongoing rhythmic pyloric activity. The schematic of the stomatogastric nervous system indicates the somatic and axonal recording sites. The soma recording shows attenuated spikes, whereas the axonal recording shows overshooting spikes. Spike amplitudes change over the course of the burst (white arrow) and ride on top of a baseline depolarization that starts abruptly with the first spike (black arrow). B, Simultaneous intracellular recordings from the soma and axon. The axon recording is from a site more proximal to the STG than used for the rest of this study. The bottom showing only the voltage range around the baseline of the axon recording reveals a slow depolarization that likely represents the attenuated remnant of the slow-wave oscillation seen in the soma recording (black arrows). C, Voltage attenuation from soma to axon. In the same experiment as shown in B, centrally generated activity was blocked and the soma penetrated with a second electrode. Steps of depolarizing and hyperpolarizing current injections show that voltage responses were substantially attenuated in the axon.