FB2026_03 , released September 17, 2026

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

Choose a record type to view annotations for this term and its child terms. Direct annotations and full annotation statements below also provide HitList buttons.

Results list data from multiple species. Choose a record type above to open its HitList.

Direct annotations: records annotated with this exact term (child terms are NOT included)

Data Class	Field	Direct annotations
Alleles (FBal)	PHENOTYPE_MANIFEST_IN
Insertions (FBti)	EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)	PHENOTYPE_MANIFEST_IN

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Alleles	Insertions	Constructs
fan-shaped body layer (all annotations which use CV term, excluding "NOT" statements)
fan-shaped body layer \| cell autonomous \| somatic clone		--

Spanning Tree (Parents/Children)

synaptic neuropil subdomain
 |__synaptic neuropil layer__
synaptic neuropil domain     |
 |__fan-shaped body__________|
central body                 |
 |__fan-shaped body__________|
                             fan-shaped body layer  33 rec.
                              |__fan-shaped body layer 1 7 rec.
                              |   |__tooth of fan-shaped body(+)
                              |__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

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	synaptic neuropil layer
Part of	fan-shaped body
Synonyms & Secondary IDs
Synonyms
	"layer of fan-shaped body" EXACT
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_00040035