FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

medulla layer M1

ID (Ontology)

FBbt:00003750 (Fly Anatomy)

Definition

Distal-most layer of the medulla. It is defined by the distal extent of the distal lamina monopolar neuron L1 arborization (Fischbach and Dittrich, 1989).[ FlyBase:FBrf0049410 FlyBase:FBrf0205531 FlyBase:FBrf0224194 ]

Also Known As

"stratum M1"

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_00003750

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)	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	Genes	Insertions	Constructs
medulla layer M1 (all annotations which use CV term, excluding "NOT" statements)
medulla layer M1 \| adult stage \| somatic clone		--		--

Spanning Tree (Parents/Children)

medulla
 |__medulla layer________
synaptic neuropil layer  |
 |__medulla layer________|
plexiform medulla        |
 |__outer medulla________|
medulla layer            |
 |__outer medulla________|
                         medulla layer M1  24 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	medulla layer
Part of	outer medulla
Synonyms & Secondary IDs
Synonyms
	"stratum M1" EXACT[ FlyBase:FBrf0205531 ]
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_00003750