ASH is a set of two ciliated neurons that are part of the amphid sensilla. The endings are in the amphid channel, which is open to the outside (figure 1). Cell bodies are situated in the lateral ganglia and send processes into the ventral cord via the amphidial commissures. From there the two processes pass up into the nerve ring, running near the middle of the neuropile, and meet and terminate at the dorsal mid-line, where there is a gap junction between them. Processes from ASH run in close association with those from AIA in the ventral part of the ring and AVB in the dorsal part of the ring. The main synaptic output is to AIA (a). Synapses are also made to AIB, RIA (d) and to AVB (b) often in association with AVA and AVD (c). Some of the vesicles in the synaptic terminals have dark cores (a). There are gap junctions to AIZ, RIC, ADA and RMG. Magnifications: (a) x 25500, (b-d) x 12750.
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