FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term medial intersegmental nerve root glial cell ID (Ontology) FBbt:00001305 (Fly Anatomy)
Definition Intersegmental nerve glial cell that is located at the medial end of the anterior branch of the intersegmental nerve root, above the lateral neuropil. It contacts both the perineurium and the cortex/neuropil interface and its position is slightly lateral to the B-SPG. It sends a process laterally along the nerve root, showing a characteristic triangular morphology. It develops from the NB1-3 neuroblast (Beckervordersandforth et al., 2008).[ FlyBase:FBrf0054242 FlyBase:FBrf0064795 FlyBase:FBrf0082171 FlyBase:FBrf0205499 FlyBase:FBrf0214261 ]
Also Known As "intersegmental glial cell 1" ; "ISG1" ; "M-ISNG" (for all, see Synonyms field below)
Comment The medial intersegmental nerve root glial cell corresponds to segment boundary cell (SBC) described by Goodman and Doe (1993) and ISPG1 described by Klambt and Goodman (1991) (Ito et al., 1995).
Links to External Ontologies
VFB:FBbt_00001305
Annotations
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Data Class Field Records
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       8
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 Alleles Genes Insertions Constructs
 medial intersegmental nerve root glial cell (all annotations which use CV term, excluding "NOT" statements)       1     10      8      7
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germ layer derivative
 |__ectodermal derivative_________________
larval VNC neuropil glial cell            |
 |__intersegmental nerve root glial cell__|
embryonic/larval lateral glial cell       |
 |__intersegmental nerve root glial cell__|
nerve root glial cell                     |
 |__intersegmental nerve root glial cell__|
                                          medial intersegmental nerve root glial cell  26 rec.
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Is a intersegmental nerve root glial cell
ectodermal derivative
Develops from neuroblast NB1-3
Part of
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Synonyms
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VFB:FBbt_00001305