RID is a single motoneuron that innervates dorsal body muscles. Its cell body is situated
in the dorsal ganglion on the dorsal mid-line. A single process emanates from the ventral side
of the cell body and runs down one side of the nerve ring and enters the neuropile of the ventral
ganglion. In the N2U series, this process was on the left-hand side; in the JSH series, it ran
to the right. The process then leaves the ventral cord via the amphidial commissure and runs
round to the dorsal cord. Here it meets a short process that has come directly from the cell
body and has a gap junction with it (d). RID probably runs along the length of the dorsal
cord. It has not been followed for the whole length but its process has been identified in the
posterior regions of the cord on the basis of the morphology of its synapses. RID has a few,
rather small, synapses, which are all in the dorsal cord. These are mainly to hypodermal cells
(a), DDn motor neurons (b) and dorsal muscles. The synaptic input is from PVC in the nerve
ring. Gap junctions are made to AVB (c) and ALA (*c).
Magnifications: (a-d) x 25500.
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