OLL is a set of two neurons with ciliated endings in the lateral outer labial sensilla. Cell
bodies are situated anteriorly to the nerve ring and have anteriorly directed processes to
the ciliated endings, which run in the two lateral labial process bundles. Posteriorly directed
processes from the cell bodies rejoin the process bundles, which initially run along the outside
of the nerve ring but then turn and run anteriorly near the inner surface. The processes of OLL bifurcate near the anterior surface of the ring; the dorsal and ventral branches run in close
association with the processes of AVE and terminate with gap junctions to their symmetrical
partners on the dorsal and ventral (b) mid-lines. The main synaptic output of OLL is to SMD (c) and to various dyadic combinations of AVE (a, b), RIB (a, b), RMD (d) and CEP.
The main synaptic input is from CEP (*f); there are also a few synapses from ADE. There
are gap junctions to RIG (*f) and IL1.
Magnifications: (a) x 25500, (b-d) x 12750.
Click pictures for higher resolution images
