FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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"
Comment Morphology 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
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      44
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       4
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       8
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       4
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 trichoid sensillum of antennal segment 3 (all annotations which use CV term, excluding "NOT" statements)      45      9      2     12     11
     trichoid sensillum of antennal segment 3 | adult stage       1       --       --       --       --
     trichoid sensillum of antennal segment 3 | ectopic       2       --       --       --       1
     trichoid sensillum of antennal segment 3 | ectopic | heat sensitive       1       --       --       --       --
     trichoid sensillum of antennal segment 3 | heat sensitive       2       --       --       --       --
     trichoid sensillum of antennal segment 3 | somatic clone       1       --       --       --       --
Spanning Tree (Parents/Children)
Only view relationship: 
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________|
                                    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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Synonyms
Secondary IDs
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VFB:FBbt_00004173