FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

proventriculus inner layer

ID (Ontology)

FBbt:00005753 (Fly Anatomy)

Definition

The inner layer of the proventriculus, produced from the invagination of the posterior region of the esophagus (foregut). It is formed by a simple low cuboidal epithelium. The cuticle the lines the inner wall is thicker than other regions in the cardia, and it forms several longitudinal folds, causing the esophageal lumen to appear irregular in cross section.[ FlyBase:FBrf0048518 FlyBase:FBrf0064792 ]

Also Known As

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

Spanning Tree (Parents/Children)

foregut
 |__foregut epithelium______
multi-tissue structure      |
 |__proventriculus__________|
epithelial tube             |
 |__gut epithelial section__|
gut epithelial section      |
 |__foregut epithelium______|
gut epithelium              |
 |__gut epithelial section__|
gut section                 |
 |__proventriculus__________|
                            proventriculus inner layer  3 rec.
                             |__adult proventriculus inner layer
                             |__embryonic/larval proventriculus inner layer

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

External Crossreferences & Linkouts