FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term lamina monopolar neuron L5 ID (Ontology) FBbt:00003725 (Fly Anatomy)
Definition A lamina monopolar neuron that hardly arborizes at all in the lamina, but forms a branched arborization in medulla layers M1 and M2 and a clump of terminals in M5. In the medulla, it forms strong reciprocal synaptic connections with monopolar lamina monopolar neuron L1 (Takemura et al., 2013). It also receives substantial input from L2 and C2 neurons and has many presynapses connecting to medullary intrinsic neurons Mi1 and Mi4, and to transmedullary neuron Tm3a (Takemura et al., 2013). It is a cholinergic neuron (Davis et al., 2020). There is usually one of these cells per optic column (Nern et al., 2025).[ FlyBase:FBrf0049410 FlyBase:FBrf0054529 FlyBase:FBrf0205531 FlyBase:FBrf0216925 FlyBase:FBrf0222324 FlyBase:FBrf0244935 FlyBase:FBrf0262545 ]
Also Known As "L5" ; "monopolar laminar cell L5"
Comment Pre- versus postsynaptic innervation judged by scoring of terminal morphology from figures in Fischbach and Dittrich (1989) as assessed by FlyBrain Neuron DB. Connectivity in the medulla was extrapolated from serial EM of 7 columns from a single sample (Takemura et al., 2013).
Links to External Ontologies
VFB:FBbt_00003725
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 lamina monopolar neuron L5 (all annotations which use CV term, excluding "NOT" statements)
     lamina monopolar neuron L5 | adult stage | somatic clone
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     lamina monopolar neuron L5 | P-stage | somatic clone
      --       --       --
      --
     lamina monopolar neuron L5 | somatic clone
      --       --       --       --       --
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cholinergic neuron
 |__adult cholinergic neuron_____________
optic lobe intrinsic columnar neuron     |
 |__lamina monopolar neuron______________|
adult neuron                             |
 |__adult cholinergic neuron_____________|
optic lobe narrow field columnar neuron  |
 |__lamina monopolar neuron______________|
                                         lamina monopolar neuron L5  51 rec.
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Is a lamina monopolar neuron
adult cholinergic neuron
Develops from immature lamina monopolar neuron L5
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FlyBrain_NDB:10093
VFB:FBbt_00003725