FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term midline primordium ID (Ontology) FBbt:00005528 (Fly Anatomy)
Definition Region of the developing embryonic central nervous system that is derived from the mesectoderm and found at the midline (Kearney et al., 2004). The mesectodermal cells have undergone further cell division and differentiation and a metameric organization is now more apparent (Kearney et al., 2004).[ FlyBase:FBrf0089570 FlyBase:FBrf0180108 FlyBase:FBrf0195284 ]
Comment Kearney et al. (2004) refer to this as 'mature midline' from stage 13, despite the presence of immature cells.
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 midline primordium (all annotations which use CV term, excluding "NOT" statements)
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embryo
 |__developing embryonic structure_______________
developing material anatomical entity            |
 |__developing embryonic structure_______________|
 |__primordium___________________________________|
presumptive embryonic/larval system              |
 |__presumptive embryonic/larval nervous system__|
ectodermal derivative                            |
 |__mesectodermal derivative_____________________|
                                                 midline primordium  240 rec.
                                                  |__midline glial primordium 25 rec.
                                                  |   |__embryonic anterior midline glial cell
                                                  |   |__embryonic posterior midline glial cell 25 rec.
                                                  |__midline neuronal primordium 6 rec.
                                                  |__somatic cell of midline primordium 25 rec.
                                                      |__embryonic anterior midline glial cell
                                                      |__embryonic posterior midline glial cell 25 rec.
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Is a developing embryonic structure
primordium
mesectodermal derivative
Part of presumptive embryonic/larval nervous system
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