VS1 [FBbt_00007517]

VS1

ID: FBbt_00007517

The outermost vertical system neuron. This neuron has a main dendritic shaft that produces one or a few dorsally projecting branches before sweeping ventrally. As the main shaft extends ventrally, it continues to produce smaller branches that combine to form a narrow band covering the most lateral part of the lobula plate. This cell is relatively flat but extends anteriorly in the dorsal aspect of its dendritic tree (Scott et al., 2002). Its receptive field of vision is the most frontal of all VS cells. It is electrically coupled to VS2 (Joesch et al., 2008). It extends a substantial proportion of processes into lobula plate layer 2 as well as layer 4 (Boergens et al., 2018).

Electrical coupling was shown indirectly by neurobiotin dye coupling in vertical system cells labelled using the P{GAL4}DB331 driver (FBti0115113) (Joesch et al., 2008). Due to its morphology and functional similarity, this cell is judged to be homologous to the VS1 cell in the blowfly (Scott et al., 2002).