FB2026_03 , released September 17, 2026
CV Term Report
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Term axon initial segment ID (Ontology) GO:0043194 (Gene Ontology)
Definition Portion of the axon proximal to the neuronal cell body, at the level of the axon hillock. The action potentials that propagate along the axon are generated at the level of this initial segment.[ PubMed:1754851 PubMed:21551097 ]
Also Known As"initial segment"
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 axon initial segment | adult stage (all annotations which use CV term, excluding "NOT" statements)
     axon initial segment | larval stage
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cellular_component
 |__cellular anatomical structure__
axon                               |
 |__main axon______________________|
cellular anatomical structure      |
 |__main axon______________________|
                                   axon initial segment
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Is a cellular anatomical structure
Part of main axon
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NIF_Subcellular:sao256000789