FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term EW1 neuron ID (Ontology) FBbt:00001583 (Fly Anatomy)
Definition Serotonergic interneuron of embryonic/larval abdominal segments A1-A7. The axon bifurcates into two thick branches as it enters dorsally into the contralateral neuropil. These two primary branches initially diverge in opposite directions and grow along the medial two-thirds of the neuropil, forming a circular pattern, with the branches meeting at the dorsal end of the neuropil. These neurons also extend an ipsilateral neurite, that seems to fasciculate with the respective neurite of the serotonergic abdominal lateral neuron and follow a similar pathway, projecting anteriorly to form the majority of its branches in the next anterior segment. In the A7 abdominal segment, this neuron has a single primary neurite that extends centrally and forms extensive varicosities. It is born from the first-born ganglion mother cell of the 7-3 lineage (GMC 7-3a).[ FlyBase:FBrf0094581 FlyBase:FBrf0100717 FlyBase:FBrf0138252 FlyBase:FBrf0207378 ]
Also Known As "larval serotonergic abdominal medial neuron"
Comment
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VFB:FBbt_00001583
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Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 EW1 neuron (all annotations which use CV term, excluding "NOT" statements)
     EW1 neuron | ectopic
      --       --
     EW1 neuron | ectopic | embryonic stage
      --       --       --
     EW1 neuron | increased number
      --       --       --
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abdominal neuron
 |__larval serotonergic abdominal neuron__
larval serotonergic VNC neuron            |
 |__larval serotonergic abdominal neuron__|
Notch OFF hemilineage primary neuron      |
 |__larval EW neuron______________________|
NB7-3 lineage neuron                      |
 |__larval EW neuron______________________|
larval interneuron                        |
 |__larval EW neuron______________________|
primary interneuron                       |
 |__larval EW neuron______________________|
                                          EW1 neuron  33 rec.
                                           |__larval serotonergic A1 neuron 1
                                           |__larval serotonergic A2 neuron 1
                                           |__larval serotonergic A3 neuron 1
                                           |__larval serotonergic A4 neuron 1
                                           |__larval serotonergic A5 neuron 1
                                           |__larval serotonergic A6 neuron 1
                                           |__larval serotonergic A7 neuron 1
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Is a larval EW neuron
larval serotonergic abdominal neuron
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VFB:FBbt_00001583