RIC is a pair of interneurons with cell bodies situated in the posterior regions of the lateral ganglia. Processes leave the cell body and enter the ventral cord via the amphidial commissures. Here they turn and run anteriorly into the nerve ring running on the dorsal surface of the neuropile. When they enter the nerve ring they move to the middle of the neuropile and run right round the nerve ring; the distal regions of each process running in close association with the proximal regions of the process of its contralateral partner. Short anteriorly directed branches come off each process sub-ventrally and sub-dorsally on the contralateral side. The main synaptic output is to AVA (a, b, c), SMD(a), and SMBD (b). There are some dark-cored vesicles present in the pre-synaptic terminals (a). The main synaptic input is from CEP (*a) and OLQ (*a); there are also some inputs from URB(*d) and URX. RIC has gap junctions to ASH and AVK (d). Magnifications: (a, d) x 25500, (b, c) x 17000.
Web adaptation, Thomas Boulin, for Wormatlas, 2001, 2002