Answer:
The germinal epithelial cells divide
repeatedly until many diploid oogonia are formed .The oogonia grow to form
primary oocytes. Each primary oocyte then gets surrounded by a layer of
granulosa cells and then called the primary follicle. The primary follicles get
surrounded by more layers of granulosa cells and called secondary follicles.
The secondary follicle soon
transforms into a tertiary follicle which is characterized by a fluid filled
cavity called antrum. The primary oocyte within the tertiary follicle undergoes
meiotic division to become a secondary oocyte and a first polar body
(haploid).The tertiary follicle further changes into the mature follicle or
Graafian follicle. The Graafianfollicle now ruptures to release the secondary
oocyte (ovum) from the ovary by the process called ovulation.
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