Primordial undifferentiated female germ cells that give rise to oocytes. They are formed during embryogenesis by mitosis in the human by weeks 4 and 8 weeks after conception, and continue to evident from 5 to 30 weeks.
See Embryogenesis, Gametes, Germ plasm, Germinal (or germ) layers, Mitosis, Oocytes, Zygote