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Fertilization & Early Development

Fertilization & Early Development. zygote. morula. Solid ball of cells 3 days after fertilization. blastocyst. Morula continues cell division and hollows out to form a blastocyst (day 5 – week 2). trophoblast. The cells that form the wall of the blastocyst. inner cell mass.

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Fertilization & Early Development

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  1. Fertilization & Early Development

  2. zygote

  3. morula Solid ball of cells 3 days after fertilization

  4. blastocyst Morula continues cell division and hollows out to form a blastocyst (day 5 – week 2)

  5. trophoblast The cells that form the wall of the blastocyst

  6. inner cell mass Eventually becomes the developing offspring

  7. embryo / gastrula Embryo is termed a gastrula at the end of the second week

  8. fetus

  9. placenta

  10. maternal portion The area of the uterine wall (decidua basalis) where the chorionic villi attach

  11. fetal portion Includes the chorion and chorionic villi that extends into the uterine wall

  12. Chorion (maroon)

  13. chorionic villi

  14. Amnion (white)

  15. amniotic cavity (space)

  16. yolk sac

  17. Allantois (future umbilical cord)

  18. Fetal circulation

  19. ductus arteriosus Connects the pulmonary trunk to the descending portion of the aortic arch Becomes ligamentum arteriosum

  20. ductus venosus Connects the umbilical vein directly to the inferior vena cava, bypassing the liver Becomes the ligamentum venosum

  21. foramen ovale An opening in the atrial septum where blood passes from the right atrium directly to the left atrium and bypassing the lungs Becomes fossa ovalis

  22. umbilical cord

  23. umbilical arteries (blue)

  24. umbilical vein (red)

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