FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term medulla layer M3 ID (Ontology) FBbt:00003752 (Fly Anatomy)
Definition Third most lateral layer of the medulla. It is defined by the proximal border of the lamina monopolar neuron L2 arborization to that of the lamina neuron L3 terminal (Fischbach and Dittrich, 1989).[ FlyBase:FBrf0049410 FlyBase:FBrf0205531 FlyBase:FBrf0224194 ]
Also Known As "L3 layer" ; "medulla layer 3" ; "stratum M3"
Comment In the literature there are two methods for describing spatial location of neurons in the visual system: distal-proximal (e.g. Fischbach and Dittrich, 1989), and medial-lateral (e.g. Ito et al., 2014), both meaning outer and inner, and refer to the distance of a structure along the visual pathway relative to the center of the brain. Currently we will adopt the classical 'distal-proximal'.
Links to External Ontologies
VFB:FBbt_00003752
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      14
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       7
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       3
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       5
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 medulla layer M3 (all annotations which use CV term, excluding "NOT" statements)      14      6     10     12
     medulla layer M3 | adult stage       2       --       --       2
     medulla layer M3 | adult stage | somatic clone       4       --       1       --
     medulla layer M3 | P-stage       6       --       2      3
     medulla layer M3 | pupal stage       2       --       --       2
     medulla layer M3 | somatic clone       1       --       --       --
Spanning Tree (Parents/Children)
Only view relationship:
  synaptic neuropil layer
   |__medulla layer
       |__medulla layer M3  42 rec.
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Is a medulla layer
Part of outer medulla
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VFB:FBbt_00003752