FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ventral organ ID (Ontology) FBbt:00002707 (Fly Anatomy)
Definition External compound sense organ of the antenno-maxillary complex of the larval head, located amongst the cirri. It contains three 'knob-like' sensilla, one bi-dendritic and two mono-dendritic. Neurons of the ventral organ connect with the larval maxillary nerve and terminate in area 2 of the subesophageal ganglion.[ FlyBase:FBrf0074007 FlyBase:FBrf0075072 FlyBase:FBrf0089570 FlyBase:FBrf0201176 ]
Also Known As "ventrales Organ" ; "VO" ; "vo"
Comment Evidence for maxillary segment origin comes from Schmidt-Ott et al., 1994. There is some disagreement about the number of sensilla in the ventral organ: Campos-Ortega and Hartenstein, 1997, mention only 3 - one with two neurons and the other two with one each; Singh and Singh, 1984, provide evidence for 5 sensilla, 4 innervated by one neuron, the other by four neurons. This ontology follows Singh and Singh, 1984.
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VFB:FBbt_00002707
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 ventral organ (all annotations which use CV term, excluding "NOT" statements)
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larval head
 |__larval antenno-maxillary sensory complex__
larval maxillary segment                      |
 |__larval maxillary segment sense organ______|
external sensory organ                        |
 |__external compound sense organ_____________|
dorsal ectoderm derivative                    |
 |__larval maxillary segment sense organ______|
compound sense organ                          |
 |__external compound sense organ_____________|
embryonic/larval head sense organ             |
 |__larval maxillary segment sense organ______|
sensory cluster                               |
 |__larval antenno-maxillary sensory complex__|
                                              ventral organ  10 rec.
                                               |__ventral organ sensillum
                                                   |__ventral organ sensillum 1
                                                   |__ventral organ sensillum 2
                                                   |__ventral organ sensillum 3
                                                   |__ventral organ sensillum 4
                                                   |__ventral organ sensillum 5
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Is a larval maxillary segment sense organ
external compound sense organ
Part of larval antenno-maxillary sensory complex
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VFB:FBbt_00002707