Oogenesis

Oogenesis - Oogenesis all primary oocytes are produced...

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Oogenesis all primary oocytes are produced between 12 weeks & 5 months of fetal life by 5 months - 7 million primary oocytes have formed by birth ~ 2 million are present At puberty - ~ 400,000 remain At 12 weeks oogonia enters first meiotic prophase, then becomes dormant Nucleus becomes large and watery - called germinal vesicle thought to protect DNA Epithelial cells (simple squamous) surround primary oocyte now called primordial follicle
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Hormones that control folliculogenesis First menstrual cycle(menarche) is initiated at puberty by gonadotropin releasing hormones (GnRH), produced by hypothalamus These hormones cause the release of Follicle stimulating hormone (FSH) & Luteinizing hormone (LH) from the pituitary FSH & LH stimulate development of 5-12 primordial follicles Develop over the next 9 days Proliferative (estrogenic, follicular) phase of menstrual cycle QuickTime ± and a TIFF (Uncompressed) decompressor are needed to see this picture.
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Ovary 1 - Primordial follicle 2 - Primary follicle 3 - Secondary follicle 4 - Tertiary follicle 5 - Antrum follici 6 - Cumulus oophorus
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Primordial to Primary follicles Squamous cells become cuboidal
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Oogenesis - Oogenesis all primary oocytes are produced...

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