FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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)
Comment The 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).
Links to External Ontologies
VFB:FBbt_00003682
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       1
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       5
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       1
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 bulb (all annotations which use CV term, excluding "NOT" statements)       1      2      6   3587
Spanning Tree (Parents/Children)
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multi-cell-component structure__
synaptic neuropil_______________|
                                synaptic neuropil domain
                                 |__bulb  3596 rec.
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Is a synaptic neuropil domain
Develops from bulb primordium
Part of lateral complex
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Synonyms
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VFB:FBbt_00003682