explain folliculogenesis

Folliculogenesis is the process of maturation of ovarian follicle. It describes the progression of a number of small primordial follicles into large preovulatory follicles that occurs in part during menstrual cycle. It is continuos, meaning that any time the ovary contains follicles in many stages of development. There are 6 stages involved in folliculogenesis namely :  
   1.  Primordial  (  dormant, small, only one layer of flat granulosa cells  ) -   Sizes about 0.03-0.05mm in diameter.
   2.  Primary      (  mititic cells, cuboidal granulosa cells  )  -  Sizes about almost 0.1mm in diameter.
   3.  Secondary  (  presence of theca cells, multiple layers of granulosa cells  ) -  Sizes about 0.2mm in diameter.
   4.  Early tertiary  ( arbitrarily divided into 5 classes of different sizes respectively )
   5.  Late tertiary (  fully formed antrum, no further , cytodifferentiation, no novel progress ) - divided into 3 classes            with different respective sizes.
   6.  Preovulatory (  Building growth in oestrogen concentration, all other follicles are atretic or dead  ).

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