Using a tiny, spherical glass lens sandwiched between two brass plates, the 17th-century Dutch microscopist Antonie van Leeuwenhoek was the first to officially describe red blood cells and sperm cells ...
This is an electron microscopy picture of a section through the flagellum of a Drosophila melanogaster sperm cell. The base of the flagellum is on the left, and the falgellum's skeleton extends from ...