FB2025_05 , released December 11, 2025

General Information
Term	adult transmedullary CB3851 neuron	ID (Ontology)	FBbt:20007266 (Fly Anatomy)
Definition	Adult transmedullary neuron with its soma distal to the medulla (Nern et al., 2025). It is mainly postsynaptic, but also has presynapses, in around 5 columns of the medulla, with arbors mainly in M6, but also other layers from M3-M8 (Nern et al., 2025). It crosses the second optic chiasm and has mixed pre- and post-synapses in around 3 columns of lobula layer 5 (Nern et al., 2025). There are approximately 370-550 of these cells per hemisphere (Nern et al., 2025).[ FlyBase:FBrf0260535 FlyBase:FBrf0260546 FlyBase:FBrf0262545 ]
Also Known As	"CB3851"
Comment	Cell type from Schlegel et al. (2024), based on FlyWire v783 (FAFB) data (Dorkenwald et al., 2024; Schlegel et al., 2024), two of three (Tm29, Tm39, Tm40) proposed subtypes identified at light level by Nern et al. (2025).
Links to External Ontologies
	VFB:FBbt_20007266
Annotations
Records annotated with this term OR any of its CHILD TERMS
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Records annotated with this exact term (annotations to child terms are NOT included)
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Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
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General Information

Term

adult transmedullary CB3851 neuron

ID (Ontology)

FBbt:20007266 (Fly Anatomy)

Definition

Adult transmedullary neuron with its soma distal to the medulla (Nern et al., 2025). It is mainly postsynaptic, but also has presynapses, in around 5 columns of the medulla, with arbors mainly in M6, but also other layers from M3-M8 (Nern et al., 2025). It crosses the second optic chiasm and has mixed pre- and post-synapses in around 3 columns of lobula layer 5 (Nern et al., 2025). There are approximately 370-550 of these cells per hemisphere (Nern et al., 2025).[ FlyBase:FBrf0260535 FlyBase:FBrf0260546 FlyBase:FBrf0262545 ]

Also Known As

"CB3851"

Comment

Cell type from Schlegel et al. (2024), based on FlyWire v783 (FAFB) data (Dorkenwald et al., 2024; Schlegel et al., 2024), two of three (Tm29, Tm39, Tm40) proposed subtypes identified at light level by Nern et al. (2025).

Links to External Ontologies

VFB:FBbt_20007266

Annotations

Records annotated with this term OR any of its CHILD TERMS

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

No relevant statements available

optic lobe intrinsic columnar neuron |__transmedullary neuron |__adult transmedullary CB3851 neuron 11 rec. |__transmedullary neuron Tm29 11 rec. |__transmedullary neuron Tm39

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Relationships
Is a	transmedullary neuron
Part of
Synonyms & Secondary IDs
Synonyms
	"CB3851" EXACT VFB_SYMBOL[ FlyBase:FBrf0260535 ]
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_20007266

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Parents/Children
View Depth

Relationships

Is a

transmedullary neuron

Part of

Synonyms & Secondary IDs

Synonyms

"CB3851" EXACT VFB_SYMBOL[ FlyBase:FBrf0260535 ]

Secondary IDs

External Crossreferences & Linkouts

VFB:FBbt_20007266