The spermatozoan is a fully mature male gamete, that is motile, and serves to fertilize the ovum.
The spermatozoan has a characteristic structure:
an oval-shaped head, which contains the nucleus and the acrosome, a granular vesicle that encases the top of the nucleus and contains hydrolytic enzymes required for penetration into the oocyte during fertilization, the midpiece, which contains a prominent array of mitochondria, which are required to produce ATP;
a tail (flagellum) composed of a core of microtubules, whose sliding is powered by flagellar dynein. Microtubules, associated motor and linker proteins are called axoneme.
In mouse, the entire development from stem cell to spermatozoan takes 34 days.
Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent