FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term protocerebral bridge ID (Ontology) FBbt:00003668 (Fly Anatomy)
Definition A handle bar-shaped synaptic neuropil located just posterior to the fan-shaped body. Its lateral edge ends at the posterior end of the inferior clamp (ICL) near the medial equatorial fascicle (MEF). A row of 18 connected slices (9 on each side of the midline, numbered 1-9 from medial to lateral) that forms a dorso-posteriorly located part of the central complex embedded in the cortex between the calyces of the two mushroom bodies.[ FlyBase:FBrf0049409 FlyBase:FBrf0205148 FlyBase:FBrf0213955 FlyBase:FBrf0224194 FlyBase:FBrf0227801 ]
Also Known As"PB" ; "PCB"
CommentThe identification of the most medial slice (slice 1) by Wolff et al. (2015) meant that the domain that was previously called slice 1 corresponds in fact to slice 2. Each of the two neighboring slices (2-3, 4-5, 6-7, 8-9) are associated more closely because small-field columnar neurons innervate the fan-shaped body via the protocerebral bridge, and these neurons are generated by the same neuroblasts, forming four groups on each side of the midline, from lateral to medial: segment pair W, X, Y and Z (Boyan and Williams et al., 2011; Ito and Awasaki, 2008).
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VFB:FBbt_00003668
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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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 protocerebral bridge (all annotations which use CV term, excluding "NOT" statements)
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adult cerebrum
 |__adult central complex_______
multi-cell-component structure  |
 |__synaptic neuropil domain____|
adult protocerebrum             |
 |__adult central complex_______|
synaptic neuropil               |
 |__synaptic neuropil domain____|
synaptic neuropil block         |
 |__adult central complex_______|
                                protocerebral bridge  774 rec.
                                 |__protocerebral bridge glomerulus 3 rec.
                                     |__protocerebral bridge glomerulus 1
                                     |__protocerebral bridge glomerulus 2
                                     |__protocerebral bridge glomerulus 3
                                     |__protocerebral bridge glomerulus 4
                                     |__protocerebral bridge glomerulus 5
                                     |__protocerebral bridge glomerulus 6
                                     |__protocerebral bridge glomerulus 7
                                     |__protocerebral bridge glomerulus 8
                                     |__protocerebral bridge glomerulus 9 1 rec.
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Is a synaptic neuropil domain
Develops from embryonic/larval protocerebral bridge - primordial
Part of adult central complex
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VFB:FBbt_00003668