VCn is a set of six motoneurons in the ventral cord, which innervate ventral body muscles and the vm2 muscles of the vulva. VC4 and VC5 (h), which are situated nearest the vulva, have short processes in the ventral cord but send several processes dorsally along the vulval hyperdermis on each side of the vulval opening, where they have large, vesicle-filled varicosities and innervate vm2 vulval muscles (a). They also synapse onto other VC neurons and receive some synaptic input from HSN in these regions. VC1, VC2, VC3 and VC6 send less extensive processes, which have similar synaptic contacts, into these vulval regions, but they have much longer processes in the ventral cord (h). These processes run near or adjacent to the bounding basal lamina in the dorsal region of the cord (figure 18). There they synapse onto DDn and VDn neurons (c) and have NMJs that are dyadic, with DDn and VDn as the second postsynaptic element (b). VCn neurons have gap junctions with each other (e) and also have some chemical synapses with each other. There are some features that seem to be unique for particular VCns thai may be significant: VC5 synapses onto DVB and DVC (d) and VC3 has a gap junction directly to the process from a vm2 muscle (f). Magnifications: (a-c, e) x 17000, (d, f) x 25500.
Web adaptation, Thomas Boulin, for Wormatlas, 2001, 2002