FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term T neuron ID (Ontology) FBbt:00003726 (Fly Anatomy)
Definition Intrinsic columnar neuron of the optic lobe that has its cell body in the posterior part of the optic lobe and a cell body fiber that bifurcates in the second optic chiasma (Fischbach and Dittrich, 1989). It has two branches, each targeting a different neuropil adjacent to the second optic chiasma (lobula, lobula plate and medulla) (Fischbach and Dittrich, 1989).[ FlyBase:FBrf0049410 ]
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VFB:FBbt_00003726
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
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 Alleles Split System Combinations  Insertions Constructs
 T neuron (all annotations which use CV term, excluding "NOT" statements)
     T neuron | adult stage | ectopic
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adult optic lobe___________________
adult optic lobe neuron____________|
adult optic lobe columnar neuron___|
adult optic lobe intrinsic neuron__|
                                   optic lobe intrinsic columnar neuron
                                    |__T neuron  176 rec.
                                        |__ChaTnew1 neuron 8 rec.
                                        |__T2 neuron 19 rec.
                                        |__T2a neuron 8 rec.
                                        |__T3 neuron 19 rec.
                                        |__T4 neuron 82 rec.
                                        |   |__T4a neuron(+) 9 rec.
                                        |   |__T4b neuron(+) 7 rec.
                                        |   |__T4c neuron 8 rec.
                                        |   |__T4d neuron 9 rec.
                                        |__T5 neuron 77 rec.
                                            |__T5a neuron(+) 9 rec.
                                            |__T5b neuron(+) 7 rec.
                                            |__T5c neuron 8 rec.
                                            |__T5d neuron 11 rec.
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Is a optic lobe intrinsic columnar neuron
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VFB:FBbt_00003726