Abstract
The fine structure of human oogonia in foetal ovaries and the stages of folliculogenesis in fertile ovaries are documented with digital images. The human oogonia show progressive changes in fine structure during folliculogenesis and oogenesis until they are ovulated and ready for fertilization. Parallel changes also occur in their relationship with the surrounding follicle cells, which support and nurse the growing and maturing oocytes untill ovulation. The inactivation of the maternal centrosome is the most significant event during human oogenesis
