Oogenesis is defined as the creation of an ovum or the egg cell.

It is the female process of the male process of gametogenesis

Occurs in the ovarian follicle.

During the female menstrual cycle, 10-20 follicles begin to develop due to the presence of elevated FSH.

Secondary follicles turn into a single healthy secondary follicle – often by day 9 of the cycle.

The remaining secondary follicles have undergone “ovarian follicle atresia”.

The only secondary follicle is now termed primary follicle.

Large amount of estradiol is produced.

Around day 14 of the cycle there is an increase in LH.

The polar body is formed.

oogenesis3

 

1.)  The beginning step is referred to as Oocytogenesis

  • This is a transition step prior to birth
  • This is the development of oocytes

2.)  The next step is Ootidogenesis

  • Oocytes turn to ootid
  • Controlled by meiosis
  • It continues up until prophase I

 

Meiosis I

  • Is a division of number of chromosomes
  • The number is cut into half
  • Is essential for sexual reproduction

 

Steps of Meiosis are:

1.) Prophase
2.) Metaphase
3.) Anaphase
4.) Telophase

 

Meiosis II

  • Starts after Meiosis I
  • Continues until metaphase II
  • When this meiosis II is finished then result is ootid and a polar body

 

Maturation

  • Polar bodies dissolve leaving only ootid
  • Ootid will mature into the ovum

 

The diagram below is from: http://www.biosci.uga.edu/almanac/

 

 

 

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