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 calledantrum.
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 that ruptures to release the secondary
oocyte (ovum)from the ovary by the process called ovulation.
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