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The Pregnancy Project Weeks 1-2

The Pregnancy Project Weeks 1-2. Mrs. Teare First Block. Morula 6 hours after Fertilization. 1. perivitelline space 2. zona pellucida 3. cell membrane 4. artifacts. 36 hours. 1. zona pellucida 2. perivitelline space 3. blastomere #1 4. blastomere #2 5. cell membrane of blastomere #1.

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The Pregnancy Project Weeks 1-2

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  1. The Pregnancy ProjectWeeks 1-2 Mrs. Teare First Block

  2. Morula 6 hours after Fertilization 1. perivitelline space 2. zona pellucida 3. cell membrane 4. artifacts

  3. 36 hours 1. zona pellucida 2. perivitelline space 3. blastomere #1 4. blastomere #2 5. cell membrane of blastomere #1

  4. 56 hours 1. zona pellucida 2. perivitelline space 3. polar body

  5. 5 daysBlastocyst leaves the ZonaPellucida

  6. Hatched Blastocyst 1. embryo at the blastocyst stage 2. empty zonapellucida

  7. 8-9 days 1. amniotic ectoderm 2. epiblast 3. amniotic cavity 4. hypoblast

  8. 11 Days 1. amniotic cavity 2. extra-embryonic endoderm 3. amnion ectoderm 4. epiblast 5. hypoblast 6. primary yolk sac (also called the primary umbilical vesicle)

  9. HCGHuman Chorionic Gonadotropin • Hormone made by the placenta • Detected about 24 hours after implantation • Blood – detected about 11 days after conception • Urine- detected about 12-14 days after conception • Doubles every 48-72 hours in pregnancy • Often used as a marker to estimate age of gestation. • Can have a normal pregnancy with very low levels of HCG

  10. Corpus Luteum • The follicle from which the fertilized egg was released. • Produces progesterone to support the pregnancy until the placenta is able to take over at around 10 weeks. • Low levels of progesterone can cause loss of the pregnancy. • Sometimes needs to be supplemented during the first trimester if maternal levels are low. • Progesterone inhibits immune responses, decreases prostaglandins, and prevents the onset of uterine contractions (spontaneous abortion).

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