FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term oviposition descending neuron oviDN ID (Ontology) FBbt:00049919 (Fly Anatomy)
Definition Female-specific adult descending neuron that stimulates oviposition (Wang et al., 2020). One branch arborizes in the superior medial protocerebrum (Wang et al., 2020; Sturner et al., 2025). Another branch projects ventrally, remaining close to the midline, which it crosses above the esophagus (Wang et al., 2020; Sturner et al., 2025). It projects through the contralateral side of the cervical connective and the median dorsal abdominal tract, and arborizes in the abdominal ganglion (Wang et al., 2020; Sturner et al., 2025). There are approximately 8 of these cells per hemisphere and they belong to the SMPpv1 lineage (Dorkenwald et al., 2024; Schlegel et al., 2024; Sturner et al., 2025). They are cholinergic (Wang et al., 2020).[ FlyBase:FBrf0245074 FlyBase:FBrf0257087 FlyBase:FBrf0260535 FlyBase:FBrf0260546 FlyBase:FBrf0262850 ]
Also Known As"oviDN"
CommentLineage inferred to be SMPpv1, based on this assignment for all oviDNs in FlyWire FAFB, and all oviDNs implied to be same hemilineage in Sturner et al. (2025). Most of this lineage predicted to be cholinergic (Eckstein et al., 2024), in line with Wang et al. (2020) stainings of oviDNa/b.
Links to External Ontologies
VFB:FBbt_00049919
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Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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 oviposition descending neuron oviDN (all annotations which use CV term, excluding "NOT" statements)
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cholinergic neuron
 |__adult cholinergic neuron_______
adult neuron                       |
 |__adult descending neuron________|
 |__adult cholinergic neuron_______|
female-specific anatomical entity  |
 |__female-specific neuron_________|
adult SMPpv1 lineage clone         |
 |__adult SMPpv1 lineage neuron____|
sexually-dimorphic neuron          |
 |__female-specific neuron_________|
adult CNS neuron                   |
 |__adult SMPpv1 lineage neuron____|
DPMpl1 lineage neuron              |
 |__adult SMPpv1 lineage neuron____|
                                   oviposition descending neuron oviDN  11 rec.
                                    |__oviposition descending neuron oviDNa 6 rec.
                                    |__oviposition descending neuron oviDNb 6 rec.
                                    |__oviposition descending neuron oviDNb'
                                    |__oviposition descending neuron oviDNd
                                    |__oviposition descending neuron oviDNv
                                    |__oviposition descending neuron oviDNx
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Is a adult descending neuron
female-specific neuron
adult SMPpv1 lineage neuron
adult cholinergic neuron
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VFB:FBbt_00049919