PVR has a cell body situated in the right lumbar ganglion. A posteriorly directed process runs to nearly the end of the tailspike (e); this observation suggests that it could be a sensory dendrite. An anteriorly directed process enters the pre-anal ganglion via the right lumbar commissure and has a gap junction with PLMR as it crosses its process. It runs anteriorly up the ventral cord near the ventral extremity of the process bundle. The process then enters the right-hand side of the nerve ring and runs right round it in an anticlockwise direction, adjacent to the inner surface of the neuropile, and ends in the left ventral region of the ring. Small branches project anteriorly from the process at each quadrant and run in the middle of the process bundles from the labial sensory receptors (IL1-b). No synapses are seen on these branches. Dark-staining regions are present in the basal lamina on the inner surface of the ring, adjacent to the process of PVR, in a few places (d). The main synaptic output is in the nerve ring and is directed to AVB (a), RIP (a, c) and AVJ (b). There is a gap junction to ALM (*d). In the ventral cord there is some synaptic input from AVM, DVA and PVM, and there are gap junctions to DVA and PLMR. Magnifications: (a) x 25500, (b-d) x 17000.
|partners||gap junctions||synapses from||synapses to and corecipients|
Web adaptation, Thomas Boulin, for Wormatlas, 2001, 2002