Oogenesis

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1. OOGENESIS
Production of Ova
What is Oogenesis
The formation, development, and maturation of an ovum.
Oogenesis begins in the female embryo
Primoridal germ cells differentiate into oogoina (stem cells)
At 2 – 7 months of gestation, ~ 1000 oogonia divide to form ~ 7 million germ cells
 From 7 – 9 months, most oogonia die
the remaining enter the first meiotic division
primary oocyte
 The primary oocytes remain resting within small follicles until puberty
Ovary
Process of Ovulation
Started by drop in estrogen
Signals hypothalamus to release GnRH
GnRH goes to pituitary, and it relases FSH
Increase in FSH stimulates about ~20 oocytes to mature
Prepared by AbdurRehman

2. Meiosis I to form secondary oocyte
One oocyte (in most cases) matures and is expelled. The others are reabsorbed
before ovulation occurs
Follicle
Estrogen and progesterone are secreted by some of the cells in the follicle
Cytoplasm and nutrients
Ovulation occurs when follicle and ovarian surface open
Corpus leuteum
The empty follicle becomes the corpus leuteum
If pregnancy does not occur, it is reabsorbed
If pregnancy does occur, it produces hormones that help maintain pregnancy
Prepared by AbdurRehman