Spermiogenesis and ultrastructure of spermatozoon of Nicolla wisniewskii (Digenea, Opecoelidae), an intestinal parasite of Salmo trutta, were studied by electron microscopy. Spermiogenesis follows the ...

"Opioids regulate spermatozoon formation, research shows." ScienceDaily. www.sciencedaily.com / releases / 2016 / 06 / 160607093912.htm (accessed April 1, 2026).

During fertilization, the entire spermatozoon enters the oocyte. However, most of its organelles, including mitochondria, are not transmitted to the offspring. A new study demonstrates for the first ...