FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term SP1 neuron ID (Ontology) FBbt:00001367 (Fly Anatomy)
Definition Bilaterally paired neuron of the embryo/larva. Each (?) abdominal segment contains a pair of SP1 neurons with an axon that crosses the ventral midline as part of the anterior commissure, wraps around the cell body of its contralateral partner and then extends anteriorly as part of the longitudinal connective. During development, these axons pioneer the anterior commissure and longitudinal connectives.[ FlyBase:FBrf0053374 FlyBase:FBrf0064795 FlyBase:FBrf0144965 ]
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VFB:FBbt_00001367
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 SP1 neuron (all annotations which use CV term, excluding "NOT" statements)
     SP1 neuron | embryonic stage
      --       --
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larval neuron
 |__larval CNS neuron__
neuron                 |
 |__pioneer neuron_____|
CNS neuron             |
 |__larval CNS neuron__|
                       SP1 neuron  16 rec.
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VFB:FBbt_00001367