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General Information
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| Term |
horizontal system neuron |
ID (Ontology) |
FBbt:00003917 (Fly Anatomy) |
| Definition |
Giant neuron with wide-field dendritic arborization in lobula plate layer 1 (Shinomiya et al., 2022). This arborization is flattened in the anterior-posterior axis (Scott et al., 2002). Most of its input is from T4a and T5a neurons (Shinomiya et al., 2022). Its axon extends medially and ventrally to innervate the adult protocerebrum (Scott et al., 2002). It is involved in the optomotor response (Heisenberg et al., 1978; Schnell et al., 2010) and responds to horizontal motion with graded membrane potential changes in a directional-selective way (Schnell et al., 2010).[ FlyBase:FBrf0032046 FlyBase:FBrf0049410 FlyBase:FBrf0155898 FlyBase:FBrf0179400 FlyBase:FBrf0200428 FlyBase:FBrf0207482 FlyBase:FBrf0210299 FlyBase:FBrf0254308 ] |
| Also Known As |
"giant horizontal cell" ; "HS" ; "HS cell" |
| Comment |
Due to their morphology and functional similarity, these cells are judged to be homologous to the three horizontal system cells in larger flies (Heisenberg et al., 1978; Rajashekhar and Shamprasad, 2004; Scott et al., 2002). The presynaptic terminals in the protocerebral region were identified by the presence of a subunit of the GABA receptor (Rdl) in horizontal system cells labelled with the P\{GAL4\}3A driver (FBti0131277). The postsynaptic terminals in the protocerebral region were labelled with P\{UAS-n-syb.mRed\} (FBtp0055749] driven by the P\{GAL4\}3A driver [FBti0131277) (Raghu et al., 2007). |
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Links to External Ontologies
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VFB:FBbt_00003917
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Annotations
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Records annotated with this term OR any of its CHILD TERMS
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Records annotated with this exact term (annotations to child terms are NOT included)
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| Data Class | Field | Records |
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| Alleles (FBal) | PHENOTYPE_MANIFEST_IN | 2 | | Insertions (FBti) | EXPRESSION_STAGE_TISSUE_POSITION | 6 |
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Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
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| Full annotation statements | Relevant FlyBase reports |
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| Alleles | | Genes | Insertions | Constructs |
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horizontal system neuron (all annotations which use CV term, excluding "NOT" statements) | 5 | 1 | 1 | 6 | 6 |
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Relationships