FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
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
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Annotations
Records annotated with this term OR any of its CHILD TERMS

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Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Genes (FBgn)GO_CELLULAR_COMPONENT
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 terminal bouton (all annotations which use CV term, excluding "NOT" statements)
     colocalizes_with | terminal bouton       --
      --       --
     is_active_in | terminal bouton       --
      --       --
     located_in | terminal bouton       --
      --       --
     terminal bouton | adult stage
      --       --       --
     terminal bouton | adult stage | decreased number
      --       --
     terminal bouton | adult stage | increased number
      --       --
     terminal bouton | first instar larval stage | increased number
      --       --       --
     terminal bouton | larval stage
      --       --
     terminal bouton | somatic clone | third instar larval stage
      --       --       --
     terminal bouton | third instar larval stage
      --       --
Spanning Tree (Parents/Children)
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Vocabulary search
neuron projection terminus
 |__axon terminus______________
synapse                        |
 |__presynapse_________________|
presynapse                     |
 |__axon terminus______________|
cellular anatomical structure  |
 |__presynapse_________________|
distal axon                    |
 |__axon terminus______________|
                               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.
                                |__synaptic vesicle, readily releasable pool 2 rec.
                                |__synaptic vesicle, resting pool
                                |__type I terminal bouton 107 rec.
                                |   |__subsynaptic reticulum 37 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