FB2026_03 , released September 17, 2026
CV Term Report
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Term larval A1-7-innervating VO1 motor neuron ID (Ontology) FBbt:00002223 (Fly Anatomy)
Definition RP4 neuron that innervates the internal ventral oblique muscle 1 (VO1; muscle 30) of segments A1-7. Its dendritic arborization occupies the intermediate domain of the ventral nerve cord neuropil. It exits the ventral nerve cord via the anterior root of the intersegmental nerve fasciculating with the ISNb nerve branch. Its soma is located in the segment anterior to the muscle it innervates (Landgraf et al., 1997). The VO1 neuron found in the metathoracic neuromere switches muscle targets during metamorphosis to become adult persistent motor neuron 30-Ib (Banerjee et al., 2016). The VO1 cells of (at least) abdominal neuromeres 1-3 die during metamorphosis (Banerjee et al., 2016).[ FlyBase:FBrf0053781 FlyBase:FBrf0064795 FlyBase:FBrf0099344 FlyBase:FBrf0208790 FlyBase:FBrf0234013 ]
Also Known As"A1-7 MN30-Ib"
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VFB:FBbt_00002223
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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 larval A1-7-innervating VO1 motor neuron (all annotations which use CV term, excluding "NOT" statements)
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RP neuron
 |__larval VO1 motor neuron___________________________
embryonic/larval motor neuron                         |
 |__abdominal segment motor neuron____________________|
lineage NB3-1 primary motor neuron                    |
 |__larval VO1 motor neuron___________________________|
type Ib motor neuron                                  |
 |__larval VO1 motor neuron___________________________|
larval internal muscle motor neuron                   |
 |__larval VO1 motor neuron___________________________|
larval A1-7-innervating ISN motor neuron              |
 |__larval lateral A1-7-innervating ISN motor neuron__|
                                                      larval A1-7-innervating VO1 motor neuron  6 rec.
                                                       |__larval VO1 motor neuron of abdominal 1 neuromere
                                                       |__larval VO1 motor neuron of abdominal 2 neuromere
                                                       |__larval VO1 motor neuron of abdominal 3 neuromere
                                                       |__larval VO1 motor neuron of abdominal 4 neuromere
                                                       |__larval VO1 motor neuron of abdominal 5 neuromere
                                                       |__larval VO1 motor neuron of abdominal 6 neuromere
                                                       |__larval VO1 motor neuron of metathoracic neuromere
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Is a larval VO1 motor neuron
abdominal segment motor neuron
larval lateral A1-7-innervating ISN motor neuron
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VFB:FBbt_00002223