FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term bulb ID (Ontology) FBbt:00003682 (Fly Anatomy)
Definition A bilaterally paired synaptic neuropil domain located lateral to the ellipsoid body and anterior lateral to the fan-shaped body. It contains 80 microglomeruli characterized by their granular texture. It is formed primarily by the collateral arborizations of neuronal fibers that project to the ellipsoid body and by the terminals of the fibers projecting from the anterior optic tubercle and other neuropils.[ FlyBase:FBrf0212704 FlyBase:FBrf0221742 FlyBase:FBrf0224194 ]
Also Known As"BU" ; "isthmus" ; "Lat Tri" (for all, see Synonyms field below)
CommentThe bulb corresponds to the medial part of the mimpr of Otsuna and Ito, (2006) and to the lateral triangle of Chiang et al. (2011) (Ito et al., 2014).
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VFB:FBbt_00003682
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
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 bulb (all annotations which use CV term, excluding "NOT" statements)
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Vocabulary search 
adult cerebrum
 |__lateral complex_____________
multi-cell-component structure  |
 |__synaptic neuropil domain____|
synaptic neuropil               |
 |__synaptic neuropil domain____|
synaptic neuropil block         |
 |__lateral complex_____________|
                                bulb  3596 rec.
                                 |__anterior bulb
                                 |__inferior bulb
                                 |__superior bulb
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Is a synaptic neuropil domain
Develops from bulb primordium
Part of lateral complex
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VFB:FBbt_00003682