FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term chiasma ID (Ontology) FBbt:00005814 (Fly Anatomy)
Definition A tract of crossing fibers, that remaps or systematically permutates the linear order between two neuropils.[ FlyBase:FBrf0224194 ]
Also Known As "chiasm" ; "decussation"
Comment
Links to External Ontologies
VFB:FBbt_00005814
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)  PHENOTYPE_MANIFEST_IN       1
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Insertions
 chiasma (all annotations which use CV term, excluding "NOT" statements)       1      1
Spanning Tree (Parents/Children)
Only view relationship: 
  neuron projection bundle
   |__tract
       |__chiasma  49 rec.
           |__anterior chiasma of the central complex
           |__optic chiasma 47 rec.
           |   |__first optic chiasma 19 rec.
           |   |__second optic chiasma 8 rec.
           |__posterior chiasma of the central complex
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Synonyms
  • "chiasm" EXACT
    "decussation" EXACT
Secondary IDs
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VFB:FBbt_00005814