The ova are developed from the primitive germ cells which are imbedded in the substance of the ovaries. Each primitive germ cell gives rise, by repeated divisions, to a number of smaller cells termed oögonia, from which the ova or primary oöcytes are developed. – See more at: http://www.nexttec.tk/2015/08/the-ovum.html#sthash.GGVD158k.dpuf
The Ovum | The Next Technology.