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| 16.32 | Human birth: day 7-12 our life as a parasite | |
| 0.1 - 0.2 mm | ||
| 7 - 12 days post-ovulation |
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| Trophoblast cells engulf and destroy cells of the uterine lining creating blood pools, both stimulating new capillaries to grow and foretelling the growth of the placenta. The inner cell mass divides, rapidly forming a two-layered disc. The top layer of cells will become the embryo and amniotic cavity, while the lower cells will become the yolk sac. |
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| Ectopic pregnancies can occur at this time and sometimes continue for up to 16 weeks of pregnancy before being noticed. Diagnosed quickly, ectopic pregnancies can be treated pharmacologically without surgery, reducing danger to the mother, and preserving the site of the ectopic pregnancy. |
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