| 1. | Eventually, the syncytiotrophoblasts come into contact with maternal blood and form chorionic villi.
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| 2. | The chorionic villi comprise the majority of the functional placenta.
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| 3. | They often surround the cytotrophoblasts, reminiscent of their normal anatomical relationship in chorionic villi.
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| 4. | Chorionic arteries branch off the umbilical artery, and supply the capillaries of the chorionic villi.
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| 5. | Chorionic villi ( from the embryo ) on the embryonic pole grow, forming chorion frondosum.
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| 6. | These structures, called the chorionic villi, carry the fetal blood supply often sampled in prenatal tests.
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| 7. | Several days later, chorionic villi in the forming placenta anchor the implantation site to the uterus.
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| 8. | The chorionic villi create a large surface to maximize the exchange that takes place between the two blood supplies.
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| 9. | The chorionic villi emerge from the chorion, invade the endometrium, and allow transfer of nutrients from maternal blood to fetal blood.
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| 10. | Expected contents include the embryo or fetus, as well as the decidua, chorionic villi, amniotic fluid, amniotic membrane and other tissue.
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