FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term trichoid sensillum of antennal segment 3 ID (Ontology) FBbt:00004173 (Fly Anatomy)
Definition Olfactory sensillum of antennal segment 3 whose external sensory part is a sharply pointed hair arising from a conspicuous cylindrical base. The walls of the hair are perforated by irregularly distributed pores connecting to a lymph filled lumen containing 1-3 ORN dendrites, unbranched except occasionally near the hair tip.[ FlyBase:FBrf0104820 FlyBase:FBrf0128642 ]
Also Known As"sensillum trichodeum of antennal segment 3"
CommentMorphology is consistent with these sensilla being olfactory (Shanbhag et al., 1999). This function has been directly confirmed by electrophysiology (Clyne et al., 1997).
Links to External Ontologies
VFB:FBbt_00004173
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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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 Alleles Genes Images Insertions Constructs
 trichoid sensillum of antennal segment 3 (all annotations which use CV term, excluding "NOT" statements)
     trichoid sensillum of antennal segment 3 | adult stage
      --       --       --       --
     trichoid sensillum of antennal segment 3 | ectopic
      --       --       --
     trichoid sensillum of antennal segment 3 | ectopic | heat sensitive
      --       --       --       --
     trichoid sensillum of antennal segment 3 | heat sensitive
      --       --       --       --
     trichoid sensillum of antennal segment 3 | somatic clone
      --       --       --       --
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Vocabulary search 
third segment of antenna
 |__antennal segment 3 sense organ__
chemosensory sensory organ          |
 |__olfactory sensory organ_________|
adult antennal sense organ          |
 |__antennal segment 3 sense organ__|
 |__adult antennal sensillum________|
eo-type sensillum                   |
 |__trichoid sensillum______________|
adult head sensillum                |
 |__adult antennal sensillum________|
olfactory system                    |
 |__olfactory sensory organ_________|
                                    trichoid sensillum of antennal segment 3  94 rec.
                                     |__antennal trichoid sensillum at1 15 rec.
                                     |__antennal trichoid sensillum at4 21 rec.
                                         |__antennal trichoid sensillum T2 3 rec.
                                         |__antennal trichoid sensillum T3 3 rec.
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Is a antennal segment 3 sense organ
olfactory sensory organ
trichoid sensillum
adult antennal sensillum
Part of
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VFB:FBbt_00004173