FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

testis sheath

ID (Ontology)

FBbt:00004955 (Fly Anatomy)

Definition

This testis sheath consists of an outer epithelial layer of pigment cells and a thin, circumferential layer of muscle cells, separated from each other by a basal lamina. A second basal lamina separates the muscle layer from the testis lumen. It forms during the pupal stage both from cells of the testis and from cells of the genital disc (Kozopas et al., 1998).[ FlyBase:FBrf0064778 FlyBase:FBrf0102352 ]

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)	EXPRESSION_STAGE_TISSUE_POSITION
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	Constructs
testis sheath (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

adult
 |__testis___________________________
gonad                                |
 |__gonadal sheath___________________|
 |__testis___________________________|
male reproductive system             |
 |__testis___________________________|
male organism                        |
 |__male-specific anatomical entity__|
multi-tissue structure               |
 |__gonadal sheath___________________|
male-specific anatomical entity      |
 |__testis___________________________|
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     testis sheath  174 rec.
                                      |__terminal epithelium of testis 15 rec.
                                      |   |__terminal epithelial cell of testis 1 rec.
                                      |__testis sheath epithelial cell 122 rec.
                                      |   |__terminal epithelial cell of testis 1 rec.
                                      |   |__testis pigment cell 117 rec.
                                      |__testis sheath muscle cell 33 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	gonadal sheath male-specific anatomical entity
Part of	testis
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts