FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term fan-shaped body layer ID (Ontology) FBbt:00040035 (Fly Anatomy)
Definition Horizontal, laminar subdivision of the fan-shaped body that results from the stratification of large field neurons. There are 8 layers that run parallel to each other increasing in width dorsally to form a fan shape (Ito et al., 2014). There is additionally a 'cap' (layer 9) that sits dorsal to layer 8 and is narrower than the other layers (Wolff et al., 2015).[ FlyBase:FBrf0049409 FlyBase:FBrf0210156 FlyBase:FBrf0221742 FlyBase:FBrf0224194 FlyBase:FBrf0227801 ]
Also Known As "layer of fan-shaped body"
Comment Based on silver staining, Hanesch et al. (1989) claim that there are 6 layers in the fan-shaped body (1-6 from top to bottom). In more recent work using the synaptic marker Nc82, Young and Armstrong (2010) state that there are 'roughly 8 layers', but note that 'establishing specific layers clearly' can often prove difficult. Lin et al. (2013) define 6 layers (a-f, from top to bottom). This ontology currently follows Ito et al. (2014), which divides the fan-shaped body into 8 layers, numbering them from bottom to top. We additionally have the extra dorsal layer (9) defined by Wolff et al. (2015).
Links to External Ontologies
VFB:FBbt_00040035
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       8
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       6
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       8
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 Insertions Constructs
 fan-shaped body layer (all annotations which use CV term, excluding "NOT" statements)       8      6      8
     fan-shaped body layer | cell autonomous | somatic clone       2       --       2
Spanning Tree (Parents/Children)
Only view relationship: 
  synaptic neuropil subdomain
   |__synaptic neuropil layer
       |__fan-shaped body layer  33 rec.
           |__fan-shaped body layer 1 7 rec.
           |__fan-shaped body layer 2 1 rec.
           |__fan-shaped body layer 3 3 rec.
           |__fan-shaped body layer 4 3 rec.
           |__fan-shaped body layer 5 7 rec.
           |__fan-shaped body layer 6 3 rec.
           |__fan-shaped body layer 7 2 rec.
           |__fan-shaped body layer 8 7 rec.
           |__fan-shaped body layer 9
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Is a synaptic neuropil layer
Part of fan-shaped body
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Synonyms
  • "layer of fan-shaped body" EXACT
Secondary IDs
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VFB:FBbt_00040035