FB2026_03 , released September 17, 2026
CV Term Report
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Term adult protocerebral bridge 1 glomerulus-fan-shaped body-round body type a neuron ID (Ontology) FBbt:00111424 (Fly Anatomy)
Definition Adult protocerebral bridge 1 glomerulus-fan-shaped body-round body neuron that does not display a phase-shift between the protocerebral bridge and the fan-shaped body (the PB glomerulus 5 cell maps to the central FB column) (Hulse et al., 2021). These cells are found in PB glomeruli 1-8, but not 9 (Wolff et al., 2015; Hulse et al., 2021). They usually target the round body contralateral to the PB glomerulus they innervate, but the glomerulus 1 cells target all three regions in the same hemisphere, though this may be the opposite hemisphere to the cell body position (Wolff et al., 2015; Hulse et al., 2021).[ FlyBase:FBrf0221742 FlyBase:FBrf0227801 FlyBase:FBrf0240744 FlyBase:FBrf0254510 ]
Also Known As"PBG1-8.s-FBl3,4,5.s.b-ROB.b" ; "PFR_a"
CommentPFR_a appears to be the subtype identified in Wolff et al. (2015), based on comparison of wiring diagrams - Fig 22 in Wolff et al. (2020) & Fig 30 in Hulse et al. (2021). This subtype was renamed in Wolff and Rubin (2018) from PBG1-8.s-FBl3,4,5.s.b-rub.b to PBG1-8.s-FBl3,4,5.s.b-ROB.b due to earlier (Wolff et al., 2015) misidentification of round body as rubus. Probably also the subtype identified by Lin et al. (2013) if G1 and G2 were both identified as G1 (existing G1 identified by Wolff et al. 2015), as G5 (called G4 in ref) links to central FB. The specific 'horizontal fiber system neurons' (HFS) described by Hanesch et al. (1989) probably also correspond to these neurons (Wolff et al., 2015). Lin et al. (2013) consider HFS to be equivalent to their PFI neurons - any neuron connecting PB, FB and IDFP (lateral accessory lobe/crepine).
Links to External Ontologies
VFB:FBbt_00111424
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 adult protocerebral bridge 1 glomerulus-fan-shaped body-round body type a neuron (all annotations which use CV term, excluding "NOT" statements)
     adult protocerebral bridge 1 glomerulus-fan-shaped body-round body type a neuron | cell autonomous | somatic clone
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adult protocerebral bridge 1 glomerulus-fan-shaped body-lateral accessory lobe neuron__
anterior ectoderm derivative___________________________________________________________|
                                                                                       adult protocerebral bridge 1 glomerulus-fan-shaped body-round body neuron
                                                                                        |__adult protocerebral bridge 1 glomerulus-fan-shaped body-round body type a neuron  36 rec.
                                                                                            |__protocerebral bridge glomerulus 1-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 2-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 3-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 4-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 5-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 6-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 7-fan-shaped body-round body type a neuron
                                                                                            |__protocerebral bridge glomerulus 8-fan-shaped body-round body type a neuron
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VFB:FBbt_00111424