| Term: | sperm sperm midpiece |
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| Note: | This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked name. |
| Name: | sperm |
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| Synonyms: | sperm cell, spermatozoid, spermatozoon |
| Definition: | A mature male germ cell that develops from a spermatid. |
| Ontology: | Anatomy Ontology [ZFA:0009006] |
| Name: | sperm midpiece |
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| Synonyms: | |
| 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. |
| Ontology: | GO: Cellular Component [GO:0097225] QuickGO AmiGO |