FB2026_03 , released September 17, 2026

CV Term Report

Help Close All Open All

General Information

Term

proximal medullary amacrine neuron Pm1

ID (Ontology)

FBbt:00003833 (Fly Anatomy)

Definition

Proximal medullary wide-field amacrine neuron that branches as it enters the proximal side of the medulla and forms broad terminal arbors, with mixed pre- and post-synaptic terminals, mainly in medulla layer M9 (Fischbach and Dittrich, 1989; Morante and Desplan, 2008).[ FlyBase:FBrf0049410 FlyBase:FBrf0204652 ]

Also Known As

"Pm1"

Comment

Neurotransmitter determined to be acetylcholine based on Cha-GAL4.7.4 driver (FBtp0014830) expression and anti-ChaT staining (Varija Raghu et al., 2011 - FBrf0212356), but scRNAseq data assigns as GABA based on Gad1 transcripts and lineage (Konstantinides et al., 2022 - FBrf0253187). EM also predicts GABA (Nern et al., 2025 - FBrf0262545). Nern et al. (2025) split this into 3 subtypes (Pm1, Pm5, Pm6), which seem to have small differences in layer and column spans.

Links to External Ontologies

VFB:FBbt_00003833

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)

Data Class	Field	Direct annotations
Alleles (FBal)	PHENOTYPE_MANIFEST_IN
Insertions (FBti)	EXPRESSION_STAGE_TISSUE_POSITION

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		Insertions	Constructs
proximal medullary amacrine neuron Pm1 (all annotations which use CV term, excluding "NOT" statements)
proximal medullary amacrine neuron Pm1 \| absent \| larval stage		--	--	--

Spanning Tree (Parents/Children)

supraesophageal ganglion neuron
 |__adult optic lobe neuron_________________
optic lobe amacrine neuron                  |
 |__proximal medullary amacrine neuron______|
adult optic lobe columnar neuron            |
 |__optic lobe wide-field columnar neuron___|
anterior ectoderm derivative                |
 |__adult optic lobe neuron_________________|
secondary neuron                            |
 |__Notch OFF hemilineage secondary neuron__|
Notch OFF hemilineage neuron                |
 |__Notch OFF hemilineage secondary neuron__|
medulla intrinsic neuron                    |
 |__proximal medullary amacrine neuron______|
adult CNS neuron                            |
 |__adult optic lobe neuron_________________|
                                            proximal medullary amacrine neuron Pm1  4 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	adult optic lobe neuron proximal medullary amacrine neuron Notch OFF hemilineage secondary neuron optic lobe wide-field columnar neuron
Develops from	immature proximal medullary amacrine neuron Pm1
Part of
Synonyms & Secondary IDs
Synonyms
	"Pm01" NARROW[ FlyBase:FBrf0260545 FlyBase:FBrf0262545 ] "Pm02" NARROW[ FlyBase:FBrf0260545 FlyBase:FBrf0262545 ] "Pm06" NARROW[ FlyBase:FBrf0260545 FlyBase:FBrf0262545 ] "Pm1" EXACT VFB_SYMBOL[ FlyBase:FBrf0247762 ] "Pm5" NARROW[ FlyBase:FBrf0262545 ] "Pm6" NARROW[ FlyBase:FBrf0262545 ]
Secondary IDs

External Crossreferences & Linkouts
	FlyBrain_NDB:10109 VFB:FBbt_00003833