has characteristic develops from sends synaptic output to region receives synaptic input throughout adult protocerebral bridge 1 glomerulus-fan-shaped body-nodulus neuron FBbt:00003634 vertical fiber system pb-fb-no neuron PFN fly_anatomy.ontology vertical fiber system neuron PFN neuron Small field neuron of the central complex that connects a single glomerulus of the protocerebral bridge with a ventral region of one column of the fan-shaped body and a contralateral nodulus (Hanesch et al., 1989; Lin et al., 2015; Wolff et al., 2020; Hulse et al., 2021). These cells do not target protocerebral bridge glomerulus 1 (Wolff et al., 2015; Hulse et al., 2021). All subtypes follow a similar wiring pattern between protocerebral bridge glomeruli and fan-shaped body columns, with the cell of the most lateral glomerulus (G9) projecting to the ipsilateral lateral FB, and the cell of the most medial glomerulus (G2) projecting to the contralateral lateral FB (Wolff et al., 2015; Hulse et al., 2021). It develops from one of the four central complex neuroblasts (Sullivan et al., 2019). PFNR neuron Lin et al. (2013) and Wolff et al. (2015) state that 'vertical fiber system' terminology of Hanesch et al. (1989) covers all subtypes of protocerebral bridge 1 glomerulus-fan-shaped body-nodulus neuron. Wiring diagram of Hanesch et al. (1989) figure 5 does not fit more recent accounts of any subtypes (Wolff et al., 2015; Hulse et al., 2021). VFS FlyBrain_NDB:10240 PFN VFB:FBbt_00003634 PFNL neuron protocerebral bridge glomerulus fan-shaped body nodulus anterior ectoderm derivative fan-shaped body extrinsic columnar neuron central complex neuroblast intrinsic neuron of the central complex bilateral