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The Reproductive System

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  1. The Reproductive System Chapter 25A

  2. Male Reproductive System

  3. The Testes • Primary male reproductive organs • Scrotum • Seminiferous tubules

  4. Sperm • Structure • head and acrosome • midpiece • tail • Semen

  5. The Accessory Organs • Epididymis • Vas deferens • Seminal vesicle • Prostate gland • Urethra • Bulbourethral glands

  6. Female Reproductive System

  7. The Ovaries • Primary female reproductive organs • Follicle • Ovulation

  8. The Accessory Organs • Oviducts or Fallopian tubes • Uterus • endometrium • Cervix • Vagina

  9. Female Reproductive Cycles • Ovarian • Menstrual • 28-day cycle • Ovulation occurs on or near day 14.

  10. Human Embryology and Birth

  11. Embryology • The study of human development between fertilization and birth • Fertilization • Implantation • Placenta

  12. Fetal Development

  13. 1-4 weeks (1 month) • Basic systems are starting to form. • Heart pumps blood. • Brain and nervous system begin developing rapidly.

  14. 5-8 weeks (2 months) • Fetus is around an inch long. • Brain waves can be measured by the 43rd day after conception. • All major organs and body systems are present.

  15. 9-13 weeks (3 months) • Baby is about the size of an apple. • Reproductive organs are distinguishable as male or female. • Sucking reflex develops. • Kidneys are functioning.

  16. 14-17 weeks (4 months) • Baby is about the length of a large sweet potato. • Lanugo covers the body. • Baby sucks his thumb and practices breathing.

  17. 18-22 weeks (5 months) • Baby is about 10 inches long and weighs nearly a pound. • Mom feels baby kicking. • Ears are well developed, and baby begins to recognize sound. • Skin is covered with vernix.

  18. 23-27 weeks (6 months) • Uterus is the size of a basketball. • Eyes open and close, and the baby responds to light. • Hiccups are common. • Baby may survive in ICU.

  19. 28-31 weeks (7 months) • Baby is 16 inches long and weighs 3 pounds. • Lanugo disappears. • Brain growth is dramatic. • Baby can recognize his mother’s voice.

  20. 32-35 weeks (8 months) • Baby is 18-20 inches long and weighs 5-6 pounds. • Fat deposits fill out baby’s form. • Lungs develop rapidly. • A baby born now has an excellent chance of being healthy.

  21. 36-40 weeks (9 months) • Full term • Rapid growth, adding 2 inches and 2.5 pounds this month • Receives antibodies from the mother

  22. Birth • Labor • Delivery • After birth