FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term embryonic/larval fan-shaped body - primordial ID (Ontology) FBbt:00111207 (Fly Anatomy)
Definition The primordium of the adult fan-shaped body in the larval posterior inferior protocerebrum (IPp or CPM). It consists of a bilaterally symmetrical slightly curved, horizontal, bar-shaped structure of tufts of filopodia, with undifferentiated synapses, branching off axon bundles stretching from the midline region posterior and adjacent to the mushroom body medial lobe, to a plexus slightly medial to the peduncle. In the late larval brain both halves are interconnected by a plexus of commissural fibers. It is formed by fan-shaped body pioneer neurons in the embryo/early larva and grows during larval development as it is invaded by secondary neurons (Andrade et al., 2019).[ FlyBase:FBrf0210156 FlyBase:FBrf0221883 FlyBase:FBrf0241389 ]
Also Known As "embryonic/larval fan-shaped body" ; "immature fan-shaped body" ; "immature FB" (for all, see Synonyms field below)
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Links to External Ontologies
VFB:FBbt_00111207
Annotations
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Data Class Field Records
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
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 Insertions
 embryonic/larval fan-shaped body - primordial (all annotations which use CV term, excluding "NOT" statements)       1
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developing material anatomical entity
 |__primordium__________________
multi-cell-component structure  |
 |__synaptic neuropil domain____|
synaptic neuropil               |
 |__synaptic neuropil domain____|
                                embryonic/larval fan-shaped body - primordial  1 rec.
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Is a primordium
synaptic neuropil domain
Part of larval posterior inferior protocerebrum
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Synonyms
Secondary IDs
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larvalbrain_axon_tract:84
larvalbrain_neuropil:398
larvalbrain_neuropil:576
VFB:FBbt_00111207