FB2026_03 , released September 17, 2026
CV Term Report
Help Close All Open All
General Information
Term T2a neuron ID (Ontology) FBbt:00003729 (Fly Anatomy)
Definition T neuron with its soma posteriorly adjacent to the gap between the medulla and lobula plate and a cell body fiber that projects along the proximal surface of the medulla before branching in the second optic chiasm (Fischbach and Dittrich, 1989; Shinomiya et al., 2019). One branch projects into a medulla column, where it forms a bushy, fine, arborization in medulla layer M9 and then projects through the rest of the medulla column, bifurcating in medulla layer M5 and forming fine arbors throughout layers M1-4. The other branch forms a terminal arborization in lobula layer 3 that is much wider than a single column and has bleb-type terminal branches.[ FlyBase:FBrf0049410 FlyBase:FBrf0222324 FlyBase:FBrf0243899 ]
Also Known As"T neuron T2a" ; "T2a"
CommentPre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB.
Links to External Ontologies
VFB:FBbt_00003729
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)
There are no annotations using this term.
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 
 T2a neuron (all annotations which use CV term, excluding "NOT" statements)
Spanning Tree (Parents/Children)
Only view relationship:
Vocabulary search 
  optic lobe intrinsic columnar neuron
   |__T neuron
       |__T2a neuron  8 rec.
Spanning Tree View Settings
Parents/Children
View Depth
Show hierarchy levels: for parents, for children
hide Relationships
Is a T neuron
Part of
hide Synonyms & Secondary IDs
Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
FlyBrain_NDB:10117
VFB:FBbt_00003729