FB2026_03 , released September 17, 2026
CV Term Report
Help Close All Open All
General Information
Term mesectoderm ID (Ontology) FBbt:00000136 (Fly Anatomy)
Definition A double row of cells located at the midline from the end of gastrulation when the mesectoderm anlage of either side meet at the midline (Campos-Ortega and Hartenstein, 1997). Initially there are approximately eight cells per segment, which soon divide to become approximately 16 cells, but these do not have a clear metameric organization at this stage (Campos-Ortega and Hartenstein, 1997; Kearney et al., 2004). These cells become elongated during stage 8, so that one end remains exposed to the outside of the embryo at the midline, in line with the ectoderm, while the other end maintains contact with the mesoderm (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 FlyBase:FBrf0180108 FlyBase:FBrf0195284 FlyBase:FBrf0244630 ]
Comment
Links to External Ontologies
Annotations
Records annotated with this term OR any of its CHILD TERMS

Choose a record type to view annotations for this term and its child terms. Direct annotations and full annotation statements below also provide HitList buttons.

    • Results list data from multiple species. Choose a record type above to open its HitList.
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
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 mesectoderm (all annotations which use CV term, excluding "NOT" statements)
     mesectoderm | germline clone
      --       --       --       --
Spanning Tree (Parents/Children)
Only view relationship:
Vocabulary search 
embryo
 |__developing embryonic structure_____
germ layer                             |
 |__ectoderm___________________________|
developing material anatomical entity  |
 |__developing embryonic structure_____|
 |__primordium_________________________|
                                       mesectoderm  183 rec.
                                        |__embryonic midline glioblast 1 rec.
                                        |__embryonic ventral midline neuroblast 47 rec.
                                        |   |__MP3 precursor 10 rec.
                                        |   |__VUM precursor(+) 24 rec.
                                        |__MP1 precursor 8 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a developing embryonic structure
primordium
Develops from mesectoderm anlage
Part of ectoderm
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
UBERON:0000927