FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term larval intersegmental nerve ID (Ontology) FBbt:00001997 (Fly Anatomy)
Definition Larval nerve found in segments T1-A7 that has two roots, carrying fibers from the neuromere of the nerve and the immediately anterior neuromere (Campos-Ortega and Hartenstein, 1997). It exits the lateral ventral nerve cord in line with the anterior commissure and its proximal region shares a glial sheath with the segmental nerve (Campos-Ortega and Hartenstein, 1997). It extends further dorsally than the segmental nerve, innervating dorsal and lateral groups of muscles and sense organs (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 ]
Also Known As"anterior fascicle" ; "ISN"
Comment
Links to External Ontologies
VFB:FBbt_00001997
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
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 larval intersegmental nerve (all annotations which use CV term, excluding "NOT" statements)
     larval intersegmental nerve | distal
      --       --       --
     larval intersegmental nerve | embryonic stage
      --       --
     larval intersegmental nerve | embryonic stage 16
      --       --
     larval intersegmental nerve | embryonic stage | maternal effect
      --       --       --       --
     larval intersegmental nerve | heat sensitive
      --       --
      --
     larval intersegmental nerve | larval stage
      --       --       --       --
     larval intersegmental nerve | third instar larval stage
      --       --       --
Spanning Tree (Parents/Children)
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Vocabulary search 
larval nervous system
 |__larval peripheral nervous system__
peripheral nervous system             |
 |__nerve_____________________________|
 |__larval peripheral nervous system__|
neuron projection bundle              |
 |__nerve_____________________________|
                                      larval intersegmental nerve  831 rec.
                                       |__larval abdominal intersegmental nerve 303 rec.
                                       |   |__larval intersegmental nerve branch ISNb of A1-7 245 rec.
                                       |   |__larval intersegmental nerve branch ISNd of A1-7 30 rec.
                                       |__larval mesothoracic intersegmental nerve 15 rec.
                                       |__larval metathoracic intersegmental nerve 14 rec.
                                       |__larval prothoracic intersegmental nerve 12 rec.
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Is a nerve
Part of larval peripheral nervous system
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Synonyms
  • "anterior fascicle" EXACT
    "ISN" EXACT
Secondary IDs
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VFB:FBbt_00001997