What are the changes in the oogonia during the transition of a primary follicle to Graafian follicle?

(N/A) The process begins with the primary oocyte within the primary follicle. As the follicle develops into a secondary follicle and then a tertiary follicle,the primary oocyte grows in size.
Within the tertiary follicle,the primary oocyte completes its first meiotic division. This is an unequal division that results in the formation of a large haploid secondary oocyte and a tiny first polar body.
The tertiary follicle then matures into a Graafian follicle. The secondary oocyte remains within the Graafian follicle until ovulation,at which point the Graafian follicle ruptures to release the secondary oocyte from the ovary.