Give the name of the structure that the phrase describes.
_ 1. The name of the ovulated structure prior to fertilization
_ 2. The blastocyst structure that becomes the embryo
_ 3. The anatomical structure where fertilization normally takes place
_ 4. The stage of the embryo that implants in the uterine wall
_ 5. After fertilization, implantation normally occurs on this day
_ 6. The membrane that forms the embryonic side of the placenta
_ 7. The structure that is formed after the morula stage
_ 8. The structure that the blastocyst sheds before implantation
_ 9. The structure that forms the maternal side of the placenta
_10. The name of the thin, protective membrane that encompasses the embryo
_11. The side of the placenta that is smooth and shiny
_12. The number of umbilical arteries in the umbilical cord
_13. The number of umbilical veins in the umbilical cord
_14. This placental structure has villi
_15. The number of primary germ layers that form all body organs
_16. Sustains the embryo with nutrients and removes wastes
_17. The name of the female gamete
. 18. The name of the male gamete
. 19. The inner layer of the uterus where implantation occurs. 20. The name of the fertilized egg
. 21. Primary germ layer that becomes the outer skin and nervous system
. 22. Primary germ layer that gives rise to epithelial lining of digestive and respiratory organs
. 23. Primary germ layer that produces bone, muscle, cartilage, and blood