ASE 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 have processes which enter the ventral cord via the amphidial commissures. From here they run anteriorly into the nerve ring and then run round it in the posterior regions of the neuropile, in close association with the processes of AIY. The distal region of each process runs outside the proximal region of the contralateral process. These two processes sandwich processes of AIY, which is the most prominent postsynaptic partner (a). Synapses are also made onto AIA (b), RIA (c) and AIB, usually in association with AWC (d). There are synaptic inputs from AIN (*a), AWA and ASI. Magnifications: (a) x 25500, (b-d) x 12750.
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