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OLQ is a set of four neurons with ciliated endings and striated rootlets in the dorsal and ventral outer labial sensilla. Cell bodies are situated anterior to the nerve ring and have anteriorly directed processes to the endings (h, i), which run in four of the six labial process bundles. Posteriorly directed processes from the cell bodies rejoin the process bundles, which run along the outside of the nerve ring and then turn and run anteriorly near its inner surface. The processes of OLQ enlarge at this point and wrap round the other processes of the bundle (b). They become small as they pass anteriorly through the NMJ complex made by IL1, URA and so on (c), and then enlarge again and run ventrally on the anterior surface of the nerve ring, in close association with the processes of RIH, until they terminate. The main synaptic output is to RIC (a); although there is only one of these synapses from each OLQ, they are large. There is also synaptic output to RMD (b) and SIB (b), usually in a dyadic combination, and also occasionally to RIH (d). The main synaptic input is from CEP (*e), IL2 (*d) and RIH (*c). There are gap junctions to URB (e), CEP (e), RIG (f), RIH (g), RIB (*c) and RMD. Magnifications: (a, c, f) x 25500, (b, d, e, g) x 12750.
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