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Embryological Development

Embryological Development. Ch 38.2 & Page 698 Early Animal Development. I 1.Development. Cell division Growth Differentiation From embryonic tissues to Specialized tissues & organs. Embryological Development. Meiosis in the Gonads. Sperm. Meiotic cell division. Egg.

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Embryological Development

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  1. Embryological Development Ch 38.2 & Page 698 Early Animal Development

  2. I 1.Development • Cell division • Growth • Differentiation • From embryonic tissues to • Specialized tissues & organs

  3. Embryological Development

  4. Meiosis in the Gonads Sperm Meiotic cell division Egg

  5. 2. Fertilization of egg in fallopian tube by sperm

  6. 3. Zygote formation • Fertilized Egg • 2n Chromo-some # • Union of sperm & egg 1N Sperm + 1N Egg = 2N Zygote

  7. 4.Implantation of egg in uterus Fertilization Implantation

  8. 5. Cleavage = Splitting by mitosis

  9. 3rd Cleavage= 8 balls • “cleave” = • To cut • Division of embryonic tissue • From the zygote to a • Multi-ball stage

  10. 6.Blastula • Hallow “ball” • After cleavage • Signals the onset of • Differentiation of embryo 5th day blastocyst

  11. Hallow Ball or Blastula

  12. 7. Gastrula • Infolding of cells • Follows • Blastua stage • Forms ? • the digestive tract

  13. 7.Differentiation • “differ” • Specialization of embryonic tissue • Orders cells into tissues & organs

  14. Experimental Studies: Cell Differentiation Diffe

  15. Embryonic Development & the “gray crescent” Diffe

  16. 9.Three cell layers Ecto= Skin & nervous • Ectoderm= outer • Mesoderm= middle • Endoderm= inner Meso= Muscles Bones Endo= Digest. Bladder

  17. Neural Tube Development • “Neural”= nervous • “tube” = spinal column

  18. 10-11.Mammal fetus & uterus • Placenta= uterine lining • Umbilical cord=connects to uterus • Amnion= sack with fluid • Fetus = baby

  19. Placenta & Umbilical Cord

  20. Fetal & Mother’s Blood • Mother’s Blood is • Separatefrom the baby! • What passes across the placenta? • Food, drugs, wastes, alcohol, oxygen • What stays behind? • Red blood cells • How are wastes removed? • Diffuse across the placenta (CO2, etc.)

  21. Marsupial Pouch

  22. Fetus Development

  23. 4 Week Embryo

  24. Ultra sound scanning

  25. Amniocentesis • Sampling the amnionic fluid • Check for chromosome abnormalities

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