FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

vas deferens

ID (Ontology)

FBbt:00004968 (Fly Anatomy)

Definition

Paired tube of the male genitalia which opens into the anterior ejaculatory duct. Its distal portion is enlarged, forming the seminal vesicle. The twisted narrow portions of the vasa deferentia merge just before the junction with the anterior ejaculatory duct. In recently emerged flies, three distinct wall layers of the vas deferens are visible: a thick inner epithelium, with columnar cells containing small nuclei, a thin inner sheath with inconspicuous, widely spaced and flattened nuclei and an outer sheath of finely reticular cytoplasm containing an occasional large nucleus.[ FlyBase:FBrf0007735 FlyBase:FBrf0029539 ]

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
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	Images	Insertions	Constructs
vas deferens (all annotations which use CV term, excluding "NOT" statements)
vas deferens \| somatic clone		--	--

Spanning Tree (Parents/Children)

organism
 |__adult____________________________
reproductive system                  |
 |__male reproductive system_________|
anatomical structure                 |
 |__multicellular structure__________|
male organism                        |
 |__male-specific anatomical entity__|
male-specific anatomical entity      |
 |__male reproductive system_________|
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     vas deferens  201 rec.
                                      |__seminal vesicle 188 rec.
                                      |   |__semen-secreting cell of the seminal vesicle
                                      |__twisted vas deferens

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	male-specific anatomical entity multicellular structure
Develops from	presumptive vas deferens
Part of	adult male reproductive system
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts