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Embryonic Development: External vs. Internal and Fetal Nourishment

Learn about the two types of embryonic development - external and internal - and the nourishment of the fetus through the placenta and umbilical cord. Follow the stages of fetal growth and development from conception to birth.

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Embryonic Development: External vs. Internal and Fetal Nourishment

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  1. Topic: Reproduction Aim: Describe the two types of development and how the fetus is nourished. Do Now: 1. Pass up your TAKE HOME TEST. 2. Copy the topic and aim. 2.Take out your Fertilization and Development ISA. HW: Asexual and Sexual Reproduction Venn Diagram

  2. Identify the stage of embryonic development occurring. CLEAVAGE

  3. Identify the stage of embryonic development. Support your answer. BLASTULA

  4. Identify the stage of embryonic development. Support your answer. MORULA

  5. Identify the stage of embryonic development. Support your answer. GASTRULA

  6. Identify the stage of embryonic development. Support your answer. DIFFERENTIATION

  7. 2 types of development • 1. External Development • OUTSIDEthe female • AQUATICandTERRESTRIALorganisms

  8. Egg Layers: All turtles

  9. All tortoises

  10. Some lizards: Iguanas, Water dragons, Geckos, Veiled chameleons, Panther chameleons Iguanas Geckos Water dragons Veiled chameleons Panther chameleons

  11. Food source  YOLK • (Embryo NOTattachedto mother)

  12. 2. Internal Development • INSIDE the female • TERRESTRIALorganisms • (and SOME AQUATIC organisms)

  13. Amniotic fluid • Protects, cushions and insulates the embryo

  14. Placenta: • Provides food and oxygen • Removes wastes • (EXCHANGE / DIFFUSION)

  15. Umbilical cord: • Blood vessels (TRANSPORT)

  16. Identify the blood vessels found in the umbilical cord. Arteries and veins

  17. 1. Identify substances that will be transported TO THE FETUS. • 2. Identify substances that will be transported AWAY FROM THE FETUS. O2, nutrients, drugs, alcohol CO2, salts, urea, water

  18. Does the mother’s blood and baby’s blood mix? NO

  19. Oviduct Placenta Amniotic fluid Umbilical cord cervix

  20. Let’s review: • Identify the types of organisms who use EXTERNAL development. • Identify the food source for en embryo developing EXTERALLY. • Identify the types of organisms who use INTERNAL development. • Identify the food source for en embryo developing INTERNALLY. • Describe the importance of the PLACENTA. • Explain the difference between the placenta and the umbilical cord. • How is the embryo protected?

  21. By only Day 20foundations of the brain, spinal cord and nervous system are already established. • By Day 21the heart begins to beat. • By the 4th week, the backbone and muscles are forming. Arms, legs, eyes, and ears have begun to show.

  22. Nowone month old, the embryo is 10,000 times larger than the original fertilized egg and is developing rapidly.

  23. At Week 5 five fingers can be discerned in the hand. The eyes darken as pigment is produced. • Brain waves can be detected and recorded. • At Week 6 the liver is now taking over production of blood cells, the brain begins to control muscle movements and organs.

  24. By the 8th Week the now-called fetus is a little more than an inch long. The fetus has now everything found in a fully developed adult. • The heart has been beating for more than a month, the kidneys are functioning; the stomach is producing digestive juices and it responds to touch.

  25. At Week 9 the tiny one has fingerprints and will curve its hand around an object placed in its palm. • By Week 10the fetus can squint, swallow, and wrinkle its forehead. At the 11th week, the fetus is now about 2 inches long. Urination occurs. Muscle movements are becoming more coordinated.

  26. 3m • Now 3 monthsold, the unborn sleeps, awakens, and exercises its muscles. It “breathes” amniotic fluid to help develop its respiratory system.Fine hair is growing on the head.

  27. At 4 monthsthe fetus is 8-10 inches long and weighs half a pound. • The mother starts to “show.” The baby’s ears are functional. • It can hear its mother.

  28. The fetus at 5 monthsis now about 12 inches long. There is definite movement felt by the mother. The unborn may jump in reactions to startling or loud noises.

  29. At the 6th monthoil and sweat glands are now functioning. The delicate skin is protected from the fetal waters by a special ointment called “vernix.” Born now and given proper care,the baby would survive…

  30. At Month 7 the baby now uses the four senses of hearing, vision, taste, and touch. The child can respond to his or her mother’s voice.

  31. In the 8th monththe skin begins to thicken with a layer of fat stored underneath for insulation and nourishment. Antibodies increasingly build up. • The baby is nearly ready for life outside the womb.

  32. Toward the end of this month the baby is ready for birth. By this time the infant normally weighs 6 to 9 pounds, and his or her heart is pumping 300 gallons of blood per day.

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