Hormonal Regulation of Oogenesis

Hormonal Regulation of Oogenesis - the hormonal secretions...

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Hormonal Regulation of Oogenesis The process of oogenesis is hormonally regulated via the hypothalamic-pituitary-ovarian axis. Hypothalamic gonadotropin-releasing hormone stimulates the secretion of the gonadotropins -- follicle-stimulating hormone and luteinizing hormone from the anterior pituitary gland. FSH stimulates the ovarian follicular cells to differentiate to 1) aid in the development of the ovum and 2) produce estrogen. LH stimulates the ovarian follicular cells to burst during ovulation ; the follicular cells then develop into the corpus luteum and continue to produce estrogen. After ovulation, the corpus luteum also secretes progesterone . Estrogen and progesterone 1) regulate
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Unformatted text preview: the hormonal secretions from the hypothalamus and anterior pituitary gland and 2) prepare the uterus for implantation of the fertilized egg. (See Figure 6) In contrast to the hormonal regulation of spermatogenesis, hormonal secretions during oogenesis (specifically during the monthly cycle of the female) are regulated by both positive and negative feedback. Early in the cycle, estrogen increases secretion of FSH and LH stimulating the development of the egg; after ovulation, estrogen and progesterone inhibit the secretion of GnRH, FSH and LH, preventing the development of a second egg during a single month. Figure 6...
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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