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The Menstrual and Ovarian Cycles The Truth behind PMS!!

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Presentation on theme: "The Menstrual and Ovarian Cycles The Truth behind PMS!!"— Presentation transcript:

1 The Menstrual and Ovarian Cycles The Truth behind PMS!!

2 What is going on all at once?

3 The Beginning and the End: Menstruation Occurs if egg is not fertilized Days 1- 5 Corpus luteum (yellow body) breaks down – –This causes drop in estrogen and progesterone Uterine lining sheds FSH increases during

4 Phase 2: Follicular Phase Days 5 –13 Low estrogen = FSH to be released This stimulates growth of follicle – –Egg begins to mature Follicle matures causing estrogen levels up – –Uterine lining begins to thicken again

5 Phase 3: Ovulation Days Sudden rush of FSH Major SPIKE of LH – –This causes follicle to break and release egg into fallopian tube FERTILIZATION MOST LIKELY TO OCCUR AT END OF OVULATION!

6 Phase 4: Luteal Phase Days LH and FSH levels crash Corpus luteum forms from broken follicle Corpus luteum secretes estrogen and progesterone ––T––This thickens uterine lining to prepare for egg


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