Ovarian development and oogenesis

Oogenesis is the process of ovum formation and maturation. During oogenesis, primordial germ cells are formed, which become oogonia and subsequently oocytes in the fetus. In the adult, oocytes mature into ova, which contain the nutrients that support the early embryo s energy requirements (Wasserman, 1996 Wasserman Albertini, 1996). 

At the time of menarche or puberty, there may be only 300 000 -400 000 oocytes in the ovaries. With the onset of puberty, a second layer begins to form from cuboidal granulosa cells these cells arise from a small number of growing follicles that have an enlarged ooplasm and a zona pellucida. 

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Perveen F, Miyata T. Effects of sublethal dose of chlorfluazuron on ovarian development and oogenesis in the common cutworm Spodoptera litura (Lepidoptera Noctuidae). Ann. 

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