LUA is a set of two interneurons with cell bodies situated in
the lumbar ganglia. Anteriorly directed processes leave the cell
bodies and enter the pre-anal ganglion via the lumbar commissures (e).
The processes of LUA run in the ventral regions of the
neuropile of the pre-anal ganglion and terminate at the anterior end
of the ganglion. LUA is quite synaptically active; its main
postsynaptic partners are AVA (a, b, c) and AVD (a).
There are also a few synapses to PVC (b) and AVJ (c). LUA receives some synaptic input from AVA (a) and
possibly AVD. There are distinctive gap junctions between LUA and PLM in the lumbar commissures (d) and possibly a gap
junction to AVA in the pre-anal ganglion. Magnifications : (a-d) x
25500.
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