FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term larval abdominal segmental nerve ID (Ontology) FBbt:00002197 (Fly Anatomy)
Definition Larval segmental nerve of a larval abdominal segment. These are only found in segments A1-7, as A8 and A9 do not have separate segmental and intersegmental nerves (Campos-Ortega and Hartenstein, 1997). It has two roots, anterior and posterior, both formed from neurons of the same segment as the nerve (Campos-Ortega and Hartenstein, 1997). Proximally it shares a glial sheath with the intersegmental nerve before branching from it at the ventral edge of the ventral oblique muscles (Campos-Ortega and Hartenstein, 1997). A thick, posteriorly directed branch (SNc) leaves the main trunk of the nerve (SNa) and splits into fine branches - 3 carrying axons from the ventral sensory cluster and a 4th carrying efferents to the ventral acute musculature (Campos-Ortega and Hartenstein, 1997). The SNa branch continues dorsally and carries efferent axons innervating the external lateral transverse and lateral oblique muscles and the axons of v'es2 and v'ch1 (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 FlyBase:FBrf0099344 ]
Also Known As "larval abdominal posterior fascicle" ; "larval abdominal SN" ; "larval segmental nerve of A1-7"
Comment
Links to External Ontologies
VFB:FBbt_00002197
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     158
Insertions (FBti)  PHENOTYPE_MANIFEST_IN      17
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      43
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 larval abdominal segmental nerve (all annotations which use CV term, excluding "NOT" statements)     158      1     17     43
     larval abdominal segmental nerve | embryonic stage       8       --       --       5
     larval abdominal segmental nerve | embryonic stage 16       1       --       --       --
     larval abdominal segmental nerve | embryonic stage | maternal effect       1       --       --       --
     larval abdominal segmental nerve | germline clone       2       --       1       --
     larval abdominal segmental nerve | heat sensitive       4       --       2       --
     larval abdominal segmental nerve | third instar larval stage       4       --       --       3
Spanning Tree (Parents/Children)
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abdominal nerve
 |__larval abdominal nerve__
nerve                       |
 |__larval segmental nerve__|
                            larval abdominal segmental nerve  297 rec.
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Is a larval segmental nerve
larval abdominal nerve
Part of larval abdominal segment A1-7
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Synonyms
  • "larval abdominal posterior fascicle" EXACT[ FlyBase:FBrf0089570 ]
    "larval abdominal SN" EXACT
    "larval segmental nerve of A1-7" EXACT
Secondary IDs
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VFB:FBbt_00002197