FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term transmedullary neuron Tm3 ID (Ontology) FBbt:00003791 (Fly Anatomy)
Definition Transmedullary narrow field neuron that terminates in lobula layers 1 and 4 with bleb-like terminal arborizations. It has fine arborizations in medulla layers M1, M4, and M5, and has bleb-type arborization in medulla layers M1, M4, M9 and M10 (Morante and Desplan, 2008; Fischbach and Dittrich, 1989). Pre-synaptic terminals are present mainly in medulla layers M9-M10, but also in all other layers where neurites extend laterally (Pankova and Borst, 2017). It receives input from lamina monopolar neuron L1 and L5 and medullary intrinsic neuron Mi1 and it outputs to T4 neurons (Takemura et al., 2013). It seems to be capable of both cholinergic (Pankova & Borst, 2017) and GABAergic (Raghu et al., 2013) neurotransmission.[ FlyBase:FBrf0049410 FlyBase:FBrf0204652 FlyBase:FBrf0213020 FlyBase:FBrf0220286 FlyBase:FBrf0222324 FlyBase:FBrf0235353 ]
Also Known As "Tm3" ; "Tm3a" ; "transmedullary neuron Tm3a"
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 to be GABA by the intersection of the expression of the VGAT-GAL4 driver (FBtp0069181) and an antibody against GABA (Raghu et al., 2013). Connectivity in the medulla was assessed by electron microscopy reconstruction from 7 columns (Takemura et al., 2013). Neuron was assessed to be cholinergic based on anti-HA antibody detection of HA-tagged VAChT expression (Pankova & Borst, 2017).
Links to External Ontologies
VFB:FBbt_00003791
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Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       2
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       5
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       3
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Relevant FlyBase reports
 Alleles  Genes  Insertions Constructs
 transmedullary neuron Tm3 (all annotations which use CV term, excluding "NOT" statements)       4      2      4      8      5     11
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transmedullary neuron
 |__narrow field transmedullary neuron_____
cholinergic neuron                         |
 |__adult cholinergic neuron_______________|
GABAergic neuron                           |
 |__adult GABAergic neuron_________________|
adult neuron                               |
 |__adult cholinergic neuron_______________|
 |__adult GABAergic neuron_________________|
secondary neuron                           |
 |__Notch ON hemilineage secondary neuron__|
Notch ON hemilineage neuron                |
 |__Notch ON hemilineage secondary neuron__|
optic lobe narrow field columnar neuron    |
 |__narrow field transmedullary neuron_____|
                                           transmedullary neuron Tm3  34 rec.
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Is a narrow field transmedullary neuron
Notch ON hemilineage secondary neuron
adult cholinergic neuron
adult GABAergic neuron
Develops from immature transmedullary neuron Tm3
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FlyBrain_NDB:10153
VFB:FBbt_00003791