FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

proventriculus outer layer

ID (Ontology)

FBbt:00005755 (Fly Anatomy)

Definition

The outer layer of the proventriculus, produced from the anterior projection of the endodermal midgut which grows over the esophagus. It can be divided into 2 zones, with the anterior region being formed by columnar cells and the posterior region by cuboidal cells. It is covered by a loose network of muscle fibers.[ FlyBase:FBrf0048518 FlyBase:FBrf0064792 ]

Also Known As

"outer wall of the cardia"

Comment

Links to External Ontologies

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

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
proventriculus outer layer (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

midgut
 |__midgut epithelium_________
multi-tissue structure        |
 |__proventriculus____________|
cuboidal/columnar epithelium  |
 |__midgut epithelium_________|
epithelial tube               |
 |__gut epithelial section____|
gut epithelial section        |
 |__midgut epithelium_________|
gut epithelium                |
 |__gut epithelial section____|
gut section                   |
 |__proventriculus____________|
                              proventriculus outer layer  16 rec.
                               |__adult proventriculus outer layer
                               |   |__adult proventriculus epithelial zone 5(+)
                               |   |__adult proventriculus epithelial zone 5.5(+)
                               |   |__adult proventriculus epithelial zone 6(+)
                               |__embryonic/larval proventriculus outer layer 12 rec.
                                   |__larval secretory cell of the proventriculus

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	gut epithelial section
Part of	proventriculus midgut epithelium
Synonyms & Secondary IDs
Synonyms
	"outer wall of the cardia" EXACT[ FlyBase:FBrf0048518 ]
Secondary IDs

External Crossreferences & Linkouts