FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term optic chiasma ID (Ontology) FBbt:00003921 (Fly Anatomy)
Definition The projection of axons between the lamina and medulla (first optic chiasma) or between the medulla and lobula (second optic chiasma). The linear order of axons along each horizontal row of retinotopic cartridges or columns is reversed by the chiasma.[ FlyBase:FBrf0224194 ]
Also Known As "OCH" ; "optic chiasm"
Comment
Links to External Ontologies
VFB:FBbt_00003921
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      15
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       2
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       3
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 optic chiasma (all annotations which use CV term, excluding "NOT" statements)      15      1      2      5
     optic chiasma | adult stage       2       --       1       --
Spanning Tree (Parents/Children)
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  tract
   |__chiasma
       |__optic chiasma  47 rec.
           |__first optic chiasma 19 rec.
           |__second optic chiasma 8 rec.
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Is a chiasma
Part of adult optic lobe
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Synonyms
Secondary IDs
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VFB:FBbt_00003921