FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
Help Close All Open All
General Information
Term asymmetrical body ID (Ontology) FBbt:00110172 (Fly Anatomy)
Definition Round synaptic neuropil of the central complex, adjacent to the ventralmost layer (1) of the fan-shaped body and dorsal to the noduli, on either side of the midline (Wolff and Rubin, 2018). The right asymmetrical body is, on average, 4x larger (by volume) than the left and some neurons have a bias towards the right hemisphere in their innervation patterns (Pascual et al., 2004; Jenett et al., 2012; Wolff and Rubin, 2018). In a small proportion (7.6%) of wild-type flies, this structure is symmetrical, with prominent (right side-like) innervation in both hemispheres (Pascual et al., 2004).[ FlyBase:FBrf0174989 FlyBase:FBrf0219813 FlyBase:FBrf0240744 ]
Also Known As "AB" ; "asymmetric body"
Comment This structure was identified by the expression of the neural protein fasciclin II (FasII) (Pascual et al., 2004). Wolff and Rubin (2018) claim this is a distinct neuropil to the fan-shaped body based on the restriction of neuronal arbors to one or the other.
Links to External Ontologies
VFB:FBbt_00110172
Annotations
Records annotated with this term OR any of its CHILD TERMS
    Results list data from multiple species. Click on a button above and use the 'Filter by species' options on the resulting HitList to retrieve species-specific data.
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       2
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       2
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 Genes Constructs
 asymmetrical body (all annotations which use CV term, excluding "NOT" statements)       2      1      4
     asymmetrical body | absent | adult stage       2       --       2
Spanning Tree (Parents/Children)
Only view relationship: 
multi-cell-component structure__
synaptic neuropil_______________|
                                synaptic neuropil domain
                                 |__asymmetrical body  7 rec.
                                     |__left asymmetrical body
                                     |__right asymmetrical body
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a synaptic neuropil domain
Part of adult central complex
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00110172