Canonical pyloric triphasic rhythm. (A) Simultaneous intracellular recordings from the core pyloric circuit neurons (top three traces) and an extracellular recording of a motor nerve (lvn) during an ongoing pyloric circuit oscillation. Cell abbreviations are: AB/PD (anterior burster/pyloric dilator, top trace, blue), LP (lateral pyloric neuron, middle trace, green), PY (pyloric neuron, bottom trace, purple). Spiking in all three cells can be measured concurrently on the lateral ventricular nerve (lvn, bottom row, colors demarcate spikes from each individual neuron and illustrate the temporal segregation of each neuron's spike times). (B) Simplified connectivity diagram of the pyloric circuit showing the individual neurons color coded as in (A) and the major synaptic connections between the cells. Notably, there is no synapse from the PY to the PD neuron. Synapses are also color coded as in (A) with the presynaptic cell determining color. All chemical synapses are inhibitory.