ASG 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. The processes run on the outside surface or the neuropile of the ventral ganglion in close association with the processes of AIA. They project into the nerve ring a short distance, ending laterally. Synaptic output is almost exclusively onto AIA (a). Some synapses are also made onto AIB in association with AIA, but AIB always seems to be the minor partner (b). Some of the vesicles in the synaptic terminals have dark cores (a). ASG is postsynaptic toAIM in a few places (c) and has gap junctions with AIZ (d) and AIN. Magnifications: (a, d) x 25500, (b, c) x 12750.
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