FB2025_05 , released December 11, 2025

General Information
Term	tectulum	ID (Ontology)	FBbt:00007727 (Fly Anatomy)
Definition	The tectulum is a distinct subdivision of the thoracic regions of the ventral nerve cord (VNC) (Power, 1948). The region forms a saddle-like structure located dorsally, primarily over the accessory mesothoracic neuropil, spanning the mesothoracic neuromere (MesoNm), and extending into the posteriormost region of the prothoracic neuromere (ProNm) and the anteriormost region of the metathoracic neuromere (MetaNm) (Power, 1948). Its internal boundaries within the VNC can be defined as the dorsal region of the neuropil posterior to the ventral ellipse in the ProNm, but dorsal to the bundles from 12B, 6B, 23 17, 18B in the MesoNm (Shepherd et al., 2016; Court et al., 2020). It extends posteriorly through the MesoNm to the entry point of hemilineage 3A in the MetaNm (Shepherd et al., 2016). It is stratified into the upper, intermediate and lower tectulum (Namiki et al., 2018; Court et al., 2020).[ FlyBase:FBrf0007196 FlyBase:FBrf0232821 FlyBase:FBrf0239335 FlyBase:FBrf0246815 ]
Also Known As	"T" ; "Tct" ; "tect"
Comment
Links to External Ontologies
	VFB:FBbt_00007727
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
No relevant statements available

General Information

Term

tectulum

ID (Ontology)

FBbt:00007727 (Fly Anatomy)

Definition

The tectulum is a distinct subdivision of the thoracic regions of the ventral nerve cord (VNC) (Power, 1948). The region forms a saddle-like structure located dorsally, primarily over the accessory mesothoracic neuropil, spanning the mesothoracic neuromere (MesoNm), and extending into the posteriormost region of the prothoracic neuromere (ProNm) and the anteriormost region of the metathoracic neuromere (MetaNm) (Power, 1948). Its internal boundaries within the VNC can be defined as the dorsal region of the neuropil posterior to the ventral ellipse in the ProNm, but dorsal to the bundles from 12B, 6B, 23 17, 18B in the MesoNm (Shepherd et al., 2016; Court et al., 2020). It extends posteriorly through the MesoNm to the entry point of hemilineage 3A in the MetaNm (Shepherd et al., 2016). It is stratified into the upper, intermediate and lower tectulum (Namiki et al., 2018; Court et al., 2020).[ FlyBase:FBrf0007196 FlyBase:FBrf0232821 FlyBase:FBrf0239335 FlyBase:FBrf0246815 ]

Also Known As

"T" ; "Tct" ; "tect"

Comment

Links to External Ontologies

VFB:FBbt_00007727

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

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Relationships
Is a	synaptic neuropil block
Part of	adult thorax adult ventral nerve cord
Synonyms & Secondary IDs
Synonyms
	"flight neuropil" RELATED[ FlyBase:FBrf0007196 ] "T" EXACT[ FlyBase:FBrf0007196 FlyBase:FBrf0246815 ] "Tct" EXACT[ FlyBase:FBrf0246815 ] "tect" EXACT[ FlyBase:FBrf0232821 ]
Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_00007727

Spanning Tree View Settings

Parents/Children
View Depth

Relationships

Is a

synaptic neuropil block

Part of

adult thorax
adult ventral nerve cord

Synonyms & Secondary IDs

Synonyms

"flight neuropil" RELATED[ FlyBase:FBrf0007196 ]
"T" EXACT[ FlyBase:FBrf0007196 FlyBase:FBrf0246815 ]
"Tct" EXACT[ FlyBase:FBrf0246815 ]
"tect" EXACT[ FlyBase:FBrf0232821 ]

Secondary IDs

External Crossreferences & Linkouts

VFB:FBbt_00007727