FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term sperm midpiece ID (Ontology) GO:0097225 (Gene Ontology)
Definition The highly organized segment of the sperm flagellum which begins at the connecting piece and is characterized by the presence of 9 outer dense fibers (ODFs) that lie outside each of the 9 outer axonemal microtubule doublets and by a sheath of mitochondria that encloses the ODFs and the axoneme; the midpiece terminates about one-fourth of the way down the sperm flagellum at the annulus, which marks the beginning of the principal piece.
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cellular_component
 |__cellular anatomical structure__
9+2 motile cilium                  |
 |__sperm flagellum________________|
                                   sperm midpiece
                                    |__sperm mitochondrial sheath
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Is a cellular anatomical structure
Part of sperm flagellum
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