FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term prothoracic gland ID (Ontology) FBbt:00001724 (Fly Anatomy)
Definition Component of the larval ring gland that is continuous with the corpus cardiacum at its ventroposterior end, encircles the aorta, and surrounds the medially-located corpus allatum at its dorsoanterior end (Dai and Gilbert, 1991; de Velasco et al., 2004; Nassel and Zandawala, 2020). It is composed of very few cells in the late embryo, but these increase in size and number during larval development (de Velasco et al., 2004). It produces ecdysone and is most active in the early wandering third instar (Dai and Gilbert, 1991; Nassel and Zandawala, 2020). During pupal development, its cells separate, shrink and degenerate and none are found attached to the adult corpus allatum or corpus cardiacum after eclosion (Dai and Gilbert, 1991).[ FlyBase:FBrf0053727 FlyBase:FBrf0064803 FlyBase:FBrf0089570 FlyBase:FBrf0179777 FlyBase:FBrf0247015 ]
Also Known As "PTG" ; "thoracic gland"
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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      82
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION      42
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       4
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      64
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 prothoracic gland (all annotations which use CV term, excluding "NOT" statements)      82     51      1     46     77
     prothoracic gland | heat sensitive       2       --       --       --       --
     prothoracic gland | larval stage      24       --       --       --      20
     prothoracic gland | larval stage | somatic clone       2       --       --       --       1
     prothoracic gland | P-stage      11       --       --       --      11
     prothoracic gland | P-stage | nutrition conditional       3       --       --       --       3
     prothoracic gland | third instar larval stage      13       --       --       3      9
Spanning Tree (Parents/Children)
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cell cluster organ
 |__neurohemal organ____________
endocrine system component      |
 |__neurohemal organ____________|
ectodermal derivative           |
 |__dorsal ectoderm derivative__|
gland                           |
 |__neurohemal organ____________|
                                prothoracic gland  257 rec.
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Is a neurohemal organ
dorsal ectoderm derivative
Develops from prothoracic gland primordium
Part of larval ring gland
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Synonyms
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