UNC-Chapel Hill BIOL 252 - Oogenesis and Sexual Cycle (7 pages)

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Oogenesis and Sexual Cycle

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Oogenesis and Sexual Cycle


Oogenesis and Sexual Cycle

Lecture number:
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University of North Carolina at Chapel Hill
Biol 252 - Fundamentals of Human Anatomy and Physiology

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BIOL 252 1s Edition Lecture 25 Outline of Last Lecture I Digestive System II Reproductive System Outline of Current Lecture I Oogenesis and Sexual Cycle II Oogenesis III Folliculogenesis IV Sexual Cycle V Ovarian Cycle VI Menstrual Cycle Current Lecture I II Oogenesis and Sexual Cycle a Sexual cycle events that recur every month when pregnancy does not intervene b Consists of two interrelated cycles controlled by shifting patterns of hormone secretion i Ovarian cycle events in ovaries ii Menstrual cycle parallel changes in uterus c Brain hypothalamus GnRH acts on anterior pituitary gland FSH LH act on gonads d HPG Axis e LH peak induces ovulation f Follicles secrete estrogen i As you increase follicle size estrogen levels increase ii After ovulation increase in secretion of progesterone iii Birth control mimics secretion of progesterone prevents follicular development and ovulation Oogenesis a Egg production b Produces haploid gametes eggs ova by means of meiosis c Distinctly cyclic event that normally releases one egg each month d Accompanied by cyclic changes in hormone secretion e Cyclic changes in histological structure of ovaries and uterus i Uterine changes result in monthly menstrual flow These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute f III Oogenesis Egg Development i 2 million oogonia remain at birth ii By 6 months of age oogonia have matured to become primary oocytes iii Remain in developmental arrest until puberty iv At puberty 400 000 primary oocytes but only about 480 will undergo ovulation one ovum ovulated every 28 days from approximate age of 14 to 50 when menopause occurs g Follicle Development folliculogenesis i Primordial follicle primary follicle secondary 1 Secondary granulosa cells zona pellucida theca folliculi 2 Tertiary antrum cumulus oophorus theca interna theca externa 3 Ovulation of mature follicle bleeding into antrum ovulated oocyte

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