FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term circular trunk visceral muscle primordium ID (Ontology) FBbt:00017015 (Fly Anatomy)
Definition Primordium of the circular visceral muscle of the trunk. Becomes distinct from the rest of the trunk mesoderm by stage 11 when two distinct layers of trunk mesoderm are apparent, the inner of which is the circular visceral muscle primordium. By stage 12, these cells form a palisade consisting of a dorsal row and a ventral row of tightly packed cells. These cells adhere to the anterior and posterior midgut rudiments as they extend. During dorsal closure they spread out to encircle the midgut.[ FlyBase:FBrf0089570 ]
Also Known As"circular visceral muscle precursor" ; "P1 ViMus" ; "trunk visceral mesoderm" (for all, see Synonyms field below)
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Alleles Genes Insertions Constructs
 circular trunk visceral muscle primordium (all annotations which use CV term, excluding "NOT" statements)
     circular trunk visceral muscle primordium | maternal effect
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embryo
 |__developing embryonic structure_____
 |__dorsal closure embryo______________|
extended germ band embryo              |
 |__late extended germ band embryo_____|
primordium                             |
 |__trunk visceral muscle primordium___|
developing material anatomical entity  |
 |__developing embryonic structure_____|
visceral trunk mesoderm derivative     |
 |__trunk visceral muscle primordium___|
                                       circular trunk visceral muscle primordium  40 rec.
                                        |__somatic cell of circular trunk visceral muscle primordium
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Is a developing embryonic structure
trunk visceral muscle primordium
Part of late extended germ band embryo
dorsal closure embryo
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