FB2026_03 , released September 17, 2026
CV Term Report
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Term fusome ID (Ontology) FBbt:00004862 (Fly Anatomy)
Definition Cytoplasmic membrane-rich zones found in developing germline stem cells and their progeny. A small spherical fusome (spectrosome) grows during germline stem cell formation into a large branched structure (polyfusome) that extends through the ring canals into every cyst cell in germarium region 2a. Once the germline cyst has stopped dividing, the fusome begins to break down, usually disappearing soon after the progeny of the germline stem cell leaves the germarium.[ FlyBase:FBrf0103408 ]
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Data ClassFieldDirect annotations
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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 fusome (all annotations which use CV term, excluding "NOT" statements)
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reproductive system
 |__gonad________________
anatomical structure     |
 |__cell component_______|
multicellular structure  |
 |__gonad________________|
                         fusome  180 rec.
                          |__female fusome 67 rec.
                          |   |__nurse cell fusome 22 rec.
                          |__male fusome 67 rec.
                          |   |__spermatocyte fusome 28 rec.
                          |__polyfusome 2 rec.
                          |__spectrosome 36 rec.
                          |   |__nurse cell spectrosome 18 rec.
                          |   |__spermatocyte cell spectrosome 8 rec.
                          |__stem cell fusome 14 rec.
                              |__elongated stem cell fusome
                              |__round stem cell fusome 7 rec.
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Is a cell component
Part of gonad
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