FB2026_03 , released September 17, 2026
CV Term Report
Help Close All Open All
General Information
Term equatorial giant horizontal cell HSE ID (Ontology) FBbt:00003919 (Fly Anatomy)
Definition Horizontal system neuron whose dendritic arbor extends over the central lobula plate (Scott et al., 2002). It has both synaptic input and output in the axon terminal in the protocerebral region (Raghu et al., 2007). The area covered by its dendrite corresponds to the center of the large equatorial field of vision. It is electrically coupled to HSN and HSS (Schnell et al., 2010). There is one of these cells on each side (Shinomiya et al., 2022).[ FlyBase:FBrf0032046 FlyBase:FBrf0049410 FlyBase:FBrf0155898 FlyBase:FBrf0179400 FlyBase:FBrf0200428 FlyBase:FBrf0207482 FlyBase:FBrf0210299 FlyBase:FBrf0254308 ]
Also Known As"horizontal system equatorial cell" ; "HS equatorial" ; "HSE" (for all, see Synonyms field below)
CommentElectrical coupling was shown indirectly by neurobiotin dye coupling in HSN and HSE cells labelled using the P\{GawB\}CG1090[NP0282] (FBti0033586) driver (Schnell et al., 2010). The postsynaptic terminals in the protocerebral region were identified by the presence of a subunit of the GABA receptor (Rdl) in horizontal system cells labelled with P\{UAS-Rdl.HA\} (FBtp0021350] driven by the P\{GAL4\}3A driver [FBti0131277) (Raghu et al., 2007). Due to their morphology and functional similarity, this cell is judged to be homologous to the equatorial horizontal system cell in larger flies (Heisenberg et al., 1978; Rajashekhar and Shamprasad, 2004; Scott et al., 2002).
Links to External Ontologies
VFB:FBbt_00003919
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 ClassFieldDirect annotations
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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
 equatorial giant horizontal cell HSE (all annotations which use CV term, excluding "NOT" statements)
Spanning Tree (Parents/Children)
Only view relationship:
Vocabulary search 
lobula plate giant neuron_______
adult visual projection neuron__|
                                horizontal system neuron
                                 |__equatorial giant horizontal cell HSE  5 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a horizontal system neuron
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00003919