FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term adult tracheal air sac ID (Ontology) FBbt:00003101 (Fly Anatomy)
Definition Air filled epithelial sac of the adult tracheal system. These highly dilated trachea consist of thin epithelium with very thin chitinous lining, lacking `taenidia` (FBbt:00005045). Consequently they are highly flexible and can collapse or expand with changes in pressure around them.[ FlyBase:FBrf0007735 ]
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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       5
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       5
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 Constructs
 adult tracheal air sac (all annotations which use CV term, excluding "NOT" statements)       5      1      9
     adult tracheal air sac | third instar larval stage | heat sensitive       5       --       5
Spanning Tree (Parents/Children)
Only view relationship: 
adult tracheal system_______
tracheal section____________|
dorsal ectoderm derivative__|
                            adult tracheal section
                             |__adult tracheal air sac  28 rec.
                                 |__abdominal air sac 3 rec.
                                 |__air sac subdivision 4 rec.
                                 |   |__lateroscutal air sac 3 rec.
                                 |   |__medioscutal air sac 3 rec.
                                 |   |__notopleural air sac 3 rec.
                                 |   |__pleural air sac 3 rec.
                                 |   |__postnotal air sac 3 rec.
                                 |   |__postocular air sac 4 rec.
                                 |   |__scutellar air sac 3 rec.
                                 |__anteroscutal air sac 2 rec.
                                 |__dorsal air sac 11 rec.
                                 |   |__lateroscutal air sac 3 rec.
                                 |   |__medioscutal air sac 3 rec.
                                 |   |__notopleural air sac 3 rec.
                                 |   |__pleural air sac 3 rec.
                                 |   |__postnotal air sac 3 rec.
                                 |   |__scutellar air sac 3 rec.
                                 |__head air sac 9 rec.
                                 |   |__antennal air sac 3 rec.
                                 |   |__dorsal head air sac 5 rec.
                                 |   |__frontal head air sac 9 rec.
                                 |   |__postgenal air sac 4 rec.
                                 |   |__postocular air sac 4 rec.
                                 |__hypopleural air sac 2 rec.
                                 |__metathoracic air sac 2 rec.
                                 |__parenteric air sac 4 rec.
                                 |__propleural air sac 3 rec.
                                 |__sternopleural air sac 3 rec.
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Is a adult tracheal section
Develops from air sac primordium
Part of
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Synonyms
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