| Name: | sperm |
|---|---|
| Synonyms: | sperm cell, spermatozoid, spermatozoon |
| Definition: | A mature male germ cell that develops from a spermatid. |
| Ontology: | Anatomy Ontology [ZFA:0009006] |
| Name: | sperm midpiece |
|---|---|
| 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 |