FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term larval abdominal intersegmental nerve ID (Ontology) FBbt:00002319 (Fly Anatomy)
Definition Larval intersegmental 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; an anterior root that is formed by neurons of the anteriorly adjacent neuromere, and a posterior root, that is formed by neurons of the same neuromere as the nerve (Campos-Ortega and Hartenstein, 1997). These roots converge and fuse shortly before leaving the ventral nerve cord (Campos-Ortega and Hartenstein, 1997). Proximally it shares a glial sheath with the segmental nerve before branching from it at the ventral edge of the ventral oblique muscles (Campos-Ortega and Hartenstein, 1997). It then runs dorsally, anterior to the segmental nerve (Campos-Ortega and Hartenstein, 1997). It has two ventral motor branches, ISNb and ISNd, which innervate the ventral lateral and ventral oblique muscles, respectively, and a lateral sensory branch that penetrates the lateral transverse muscle fibers to reach the lateral sensory cluster (Campos-Ortega and Hartenstein, 1997). Further dorsally, upon entering the dorsal muscle group, it splits to form an externally directed sensory branch connected to the dorsal sensory cluster, and an internally directed branch which carries efferent axons to the dorsal musculature (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 FlyBase:FBrf0099344 ]
Also Known As "larval abdominal anterior fascicle" ; "larval abdominal ISN" ; "larval intersegmental nerve of A1-7"
Comment
Links to External Ontologies
VFB:FBbt_00002319
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      35
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       3
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      15
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Relevant FlyBase reports
 Alleles Images Insertions Constructs
 larval abdominal intersegmental nerve (all annotations which use CV term, excluding "NOT" statements)      35      2      3     15
Spanning Tree (Parents/Children)
Only view relationship: 
larval abdomen
 |__larval abdominal nerve_________
larval abdominal segment           |
 |__larval abdominal segment A1-7__|
abdominal nerve                    |
 |__larval abdominal nerve_________|
nerve                              |
 |__larval intersegmental nerve____|
larval peripheral nervous system   |
 |__larval intersegmental nerve____|
 |__larval abdominal nerve_________|
anterior abdominal segment         |
 |__larval abdominal segment A1-7__|
                                   larval abdominal intersegmental nerve  307 rec.
                                    |__larval intersegmental nerve branch ISNb of A1-7 249 rec.
                                    |__larval intersegmental nerve branch ISNd of A1-7 30 rec.
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Is a larval intersegmental nerve
larval abdominal nerve
Part of larval abdominal segment A1-7
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Synonyms
  • "larval abdominal anterior fascicle" EXACT[ FlyBase:FBrf0089570 ]
    "larval abdominal ISN" EXACT
    "larval intersegmental nerve of A1-7" EXACT
Secondary IDs
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VFB:FBbt_00002319