RIB is a set of two interneurons with cell bodies in the
lateral ganglia. Processes enter the ventral cord via the amphidial
commissures and project anteriorly, running in the ventral regions of
the cord. AIY often wraps round the processes of RIB in
the region of the ventral ganglion (e). Processes enter the ring and
run round it near the outside surface and the posterior face,
eventually meeting and stopping at the dorsal mid-line with a gap
junction to their contralateral partners (a). There are two branch
points situated near the sub-dorsal and the sub-ventral process
bundles from the labial sensilla; dorsally and ventrally directed
branches from these points run, closely associated with the processes
of AVE, in the anterior regions of the nerve ring. These
processes terminate with gap junctions to their contralateral partners
on the dorsal (b) and ventral (d) mid-lines. There are also laterally
situated gap junctions between processes of the same cell (c). The
main synaptic outputs are to AVE (h), RIA (f), AIB, AIZ (h) and AVA (g) but the synapses are
generally rather small. The main synaptic inputs are from: OLL (*a), AUA (*a), AIY (*e), BAG (*a), RIG (*d), AIN (*c), AIB (*a), RIS (*c), RIH (*b) and URY. RIB is unusual as it has gap junctions to many
other classes of cell; these are OLQ (c), AVB (g), RIG (*g), SIB (*c), SIA (*a), SMB, DVB and SMD. Magnifications: (a, b, d, e, h) x 12750, (c, f, g) x 25500.
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