Cell Component
sperm midpiece
Subclass of:
sperm cell
Definitions related to sperm midpiece:
  • 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.
    Gene Ontology Dictionary
    Gene Ontology Consortium, 2021
  • The middle piece of the spermatozoon is a highly organized segment consisting of MITOCHONDRIA, the outer dense fibers and the core microtubular structure.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
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