FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ovarian sheath ID (Ontology) FBbt:00004896 (Fly Anatomy)
Definition A tubular structure which surrounds the ovarian basement membrane (tunica propria) around each ovariole (Cummings, 1974). The main part of the sheath is a layer consisting mainly of circular and longitudinal muscle fibers and tracheoles (Cummings, 1974). This is sandwiched between two thin, acellular elastic membranes (Cummings, 1974).[ FlyBase:FBrf0018806 FlyBase:FBrf0019876 FlyBase:FBrf0064777 FlyBase:FBrf0244732 ]
Also Known As"epithelial sheath" ; "ovariole sheath"
CommentThe ovarian sheath, which surrounds each ovariole, is distinct from the peritoneal sheath, which surrounds each ovary.
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 ovarian sheath (all annotations which use CV term, excluding "NOT" statements)
     ovarian sheath | absent
      --
      --
     ovarian sheath | adult stage
      --
      --
     ovarian sheath | ectopic
      --       --       --
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adult
 |__ovary______________________________
gonad                                  |
 |__gonadal sheath_____________________|
 |__ovary______________________________|
female reproductive system             |
 |__ovary______________________________|
multi-tissue structure                 |
 |__gonadal sheath_____________________|
female organism                        |
 |__female-specific anatomical entity__|
female-specific anatomical entity      |
 |__ovary______________________________|
anatomical entity                      |
 |__female-specific anatomical entity__|
                                       ovarian sheath  59 rec.
                                        |__inner layer of ovarian sheath
                                        |__median layer of ovarian sheath 37 rec.
                                        |   |__ovarian sheath cell(+) 37 rec.
                                        |__outer layer of ovarian sheath
                                        |__pedicel of ovarian sheath 1 rec.
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Is a gonadal sheath
female-specific anatomical entity
Develops from larval sheath cell of ovary
Part of ovary
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