FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
Help Close All Open All
General Information
Term germ layer ID (Ontology) FBbt:00000110 (Fly Anatomy)
Definition Complex primordium that is formed during gastrulation (stage 6-7), when anlagen invaginate from the monolayer of the cellular blastoderm (Campos-Ortega and Hartenstein, 1997; Hartenstein, 2004). The invaginated anlagen become organized into the middle two layers of a three-layered tube structure (Campos-Ortega and Hartenstein, 1997). These three layers correspond to the three germ layers of the endoderm, mesoderm and ectoderm (from inner to outer, respectively), with each layer having distinct cell division patterns and cell fates (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 FlyBase:FBrf0155831 FlyBase:FBrf0178740 ]
Comment
Links to External Ontologies
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       2
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
 germ layer (all annotations which use CV term, excluding "NOT" statements)       2
     germ layer | embryonic stage       2
Spanning Tree (Parents/Children)
Only view relationship: 
embryo
 |__developing embryonic structure_____
developing material anatomical entity  |
 |__developing embryonic structure_____|
 |__primordium_________________________|
multicellular structure                |
 |__portion of tissue__________________|
                                       germ layer  2944 rec.
                                        |__ectoderm 1424 rec.
                                        |   |__anterior ectoderm(+) 476 rec.
                                        |   |__mesectoderm(+) 183 rec.
                                        |   |__neurogenic region(+) 536 rec.
                                        |   |__somatic cell of ectoderm(+) 48 rec.
                                        |   |__thoracic limb primordium
                                        |   |__trunk ectoderm(+) 993 rec.
                                        |__endoderm 886 rec.
                                        |   |__anterior endoderm(+) 631 rec.
                                        |   |__posterior endoderm 769 rec.
                                        |   |__somatic cell of endoderm
                                        |__mesoderm 1987 rec.
                                            |__caudal mesoderm(+) 203 rec.
                                            |__head mesoderm(+) 905 rec.
                                            |__somatic cell of mesoderm(+)
                                            |__trunk mesoderm(+) 1383 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a developing embryonic structure
primordium
portion of tissue
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
UBERON:0000923