FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

T4 neuron

ID (Ontology)

FBbt:00003731 (Fly Anatomy)

Definition

T neuron with its cell body posterior to the lobula plate and a cell body fiber that projects through the lobula plate and via the second optic chiasma, with little or no arborization, to medulla layer 10 (Fischbach and Dittrich, 1989; Shinomiya et al., 2019). It forms a fine arborization in medulla layers M9 and M10 and its axon then doubles back across the second optic chiasma to form bleb-type arborizations in a single layer of the lobula plate (Fischbach and Dittrich, 1989; Shinomiya et al., 2019). It is a cholinergic neuron (Mauss et al., 2014; Shinomiya et al., 2014). There are a large number of these cells, which are generated from neuroblasts that amplify by symmetric division (type III) before generating the T4 (and T5) neurons (Mora et al., 2018).[ FlyBase:FBrf0049410 FlyBase:FBrf0222324 FlyBase:FBrf0224060 FlyBase:FBrf0225094 FlyBase:FBrf0238554 FlyBase:FBrf0243899 ]

Also Known As

"T neuron T4" ; "T4"

Comment

Pre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB. The neurotransmitter was assessed with a split-GAL4 strategy using a Chat-DBD allele (FBal0198074) (Mauss et al., 2014) and single-cell transcript profiling (Shinomiya et al., 2014).

Links to External Ontologies

VFB:FBbt_00003731

Annotations

Records annotated with this term OR any of its CHILD TERMS

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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
Insertions (FBti)	PHENOTYPE_MANIFEST_IN
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	Split System Combinations	Genes	Insertions	Constructs
T4 neuron (all annotations which use CV term, excluding "NOT" statements)
T4 neuron \| adult stage		--	--		--
T4 neuron \| P-stage		--	--	--	--
T4 neuron \| somatic clone \| third instar larval stage		--	--	--

Spanning Tree (Parents/Children)

neuron
 |__secondary neuron__________________
cholinergic neuron                    |
 |__adult cholinergic neuron__________|
optic lobe intrinsic columnar neuron  |
 |__T neuron__________________________|
adult neuron                          |
 |__adult cholinergic neuron__________|
                                      T4 neuron  82 rec.
                                       |__T4a neuron 9 rec.
                                       |   |__T4ai neuron
                                       |   |__T4aii neuron
                                       |__T4b neuron 7 rec.
                                       |   |__T4bi neuron
                                       |   |__T4bii neuron
                                       |__T4c neuron 8 rec.
                                       |__T4d neuron 9 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	T neuron secondary neuron adult cholinergic neuron
Develops from	immature T4 neuron
Part of
Synonyms & Secondary IDs
Synonyms
	"T neuron T4" EXACT "T4" EXACT VFB_SYMBOL[ FlyBase:FBrf0247762 ]
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_00003731