FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term terminal bouton ID (Ontology) GO:0043195 (Gene Ontology)
Definition Terminal inflated portion of the axon, containing the specialized apparatus necessary to release neurotransmitters. The axon terminus is considered to be the whole region of thickening and the terminal bouton is a specialized region of it.[ PubMed:10218156 PubMed:8409967 ]
Also Known As "bouton" ; "presynaptic bouton" ; "synaptic bouton" (for all, see Synonyms field below)
Comment
Links to External Ontologies
  QuickGO data     AmiGO data
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      50
Genes (FBgn)  GO_CELLULAR_COMPONENT      52
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       2
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      29
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 Insertions Constructs
 terminal bouton (all annotations which use CV term, excluding "NOT" statements)      50     67      2     29
     colocalizes_with | terminal bouton       --       1       --       --
     is_active_in | terminal bouton       --      10       --       --
     located_in | terminal bouton       --      44       --       --
     terminal bouton | adult stage       3       --       --       --
     terminal bouton | adult stage | decreased number       2       --       --       1
     terminal bouton | adult stage | increased number       8       --       --       7
     terminal bouton | first instar larval stage | increased number       1       --       --       --
     terminal bouton | larval stage      28       --       --       9
     terminal bouton | somatic clone | third instar larval stage       1       --       --       --
     terminal bouton | third instar larval stage      42       --       --      25
Spanning Tree (Parents/Children)
Only view relationship:
  cellular anatomical structure
   |__presynapse
       |__terminal bouton  240 rec.
           |__C bouton
           |__F bouton
           |__hippocampal mossy fiber expansion
           |__multiple synapse bouton
           |   |__multiple synapse bouton, contacting multiple dendrites
           |   |__multiple synapse bouton, contacting single dendrite
           |__photoreceptor cell terminal bouton
           |__rod bipolar cell terminal bouton
           |__S bouton 1 rec.
           |__type I terminal bouton 107 rec.
           |   |__type Ib terminal bouton 41 rec.
           |   |__type Is terminal bouton 35 rec.
           |__type II terminal bouton 13 rec.
           |__type III terminal bouton 2 rec.
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Is a presynapse
Part of axon terminus
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Synonyms
  • "bouton" EXACT
    "presynaptic bouton" EXACT
    "synaptic bouton" EXACT
    "terminal button" EXACT
Secondary IDs
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NIF_Subcellular:sao187426937