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Menstrual Cycle, Spermatogenesis and Fertilzation

Menstrual Cycle, Spermatogenesis and Fertilzation. By: Jonathan and Armin. Anatomy. Menstrual Cycle. The cycle of changes in the female reproductive organs that prepares the body for pregnancy Lasts 28 days Controlled by hormones from the ovary

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Menstrual Cycle, Spermatogenesis and Fertilzation

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  1. Menstrual Cycle, Spermatogenesis and Fertilzation By: Jonathan and Armin

  2. Anatomy

  3. Menstrual Cycle • The cycle of changes in the female reproductive organs that prepares the body for pregnancy • Lasts 28 days • Controlled by hormones from the ovary • Ovary has 100 000’s of follicles with an immature egg • Ovum has the female genetic information

  4. Menstrual cycle Day 1-14 • Day 1-7: several follicles start to grow and release estrogen • Day 7: all follicles degrade except one • Day 12: follicle releases estrogen to the blood. The pituitary in the brain releases Luteinizing hormone

  5. Menstrual Cycle Ovulation • Ovulation: the release of a ripe ovum • Day 14: LH makes the follicle grow and the ovum is squeezed out • Fallopian tube surrounds ovum and moves it to the uterus • Lives for 12-14 hours • If not fertilized, it dissolves and is shed with the uterus lining

  6. Menstrual Cycle Day 15-28 • Day 15-22:The ovum travels down the Fallopian tubes to the uterus • Day 23-28: If the egg is not fertilized, no estrogen of progesterone is produced • The thick lining in the uterus is not needed and is shed • The menstrual cycle starts again

  7. Anatomy: Spermatogenesis

  8. Spermatogenesis • Sperm contains the male genetic information • Is called a male gamete • After 13 years of age, millions made daily • Testosterone made by testicles • Sperm form in the testicles • Spends 4-6 weeks developing in the epididymis • Moves to the vas deferens

  9. Spermatogenesis • Seminal fluid is produced by the seminal vesicles and the prostate gland • Sperm are carried in the seminal fluid and move through the urethra during ejaculation • Each time up to 500 million sperm are released • Takes 70 days to mature

  10. Fertilization • The joining together of the female ovum and the male sperm • Conception is when the sperm enters the ovum in the Fallopian tubes • Only one sperm can penetrate the ovum • The male and female gametes join to form a zygote

  11. Fertilization • The 2 cells divide to make 4 • Keep dividing until the embryo is full grown • After 7 days, embryo implanted in the uterus • The menstrual cycle stops until a few weeks after birth

  12. Fertilization

  13. Bibliography • Hyde/DeLamater Understanding Human Sexuality 1997 McGraw-Hill Compamies • http://deerparkhpe.wikispaces.com/7-2+HEALTH+2010-11 • http://www.google.ca/imghp?hl=en&tab=wi

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