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Menstrual Cycle

Menstrual Cycle. The Cycle. Strongly linked to the endocrine system (hormone based) Typically takes 28 days to cycle through 4 phases Follicular Ovulation Luteal Menstruation Hormones raise and fall. Ovulation. Follicular. Begins when estrogen levels are low

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Menstrual Cycle

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  1. Menstrual Cycle

  2. The Cycle • Strongly linked to the endocrine system (hormone based) • Typically takes 28 days to cycle through 4 phases • Follicular • Ovulation • Luteal • Menstruation • Hormones raise and fall

  3. Ovulation

  4. Follicular • Begins when estrogen levels are low • Anterior pituitary secretes FSH and LH, stimulation follicle to develop • Cells around egg enlarge, releasing estrogen • This causes this uterine lining to thicken

  5. Ovulation • LH and FSH still being released, for another 3-4 days • Follicle ruptures, releasing ova into the Fallopian tubes

  6. Luteal • Now empty follicle changes to a yellow colour, becomes corpus luteum • Continues to secrete estrogen, but now beings to release progesterone • Progesterone further develops uterine lining • If pregnant, embryo will release hormones to preserve corpus luteum

  7. Menstruation • Menstruation • If no embryo, the corpus luteum begins to disintegrate • Progesterone levels drop, uterine lining detaches, menstruation can begin • Tissue, blood, unfertilized egg all discharged • Can take from 3-7 days

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