| 1. | Some teratomas contain yolk sac elements, which secrete alpha-fetoprotein ( AFP ).
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| 2. | Extraembryonic endoderm ( including Yolk sac ) is derived from hypoblast cells.
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| 3. | The embryos are supported in placental yolk sac inside the mother.
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| 4. | A normal gestation would reveal a gestational sac, yolk sac, and fetal pole.
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| 5. | Following this, external feeding begins once the yolk sac has depleted.
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| 6. | The juvenile coelacanth's broad yolk sac hangs below the pelvic fins.
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| 7. | The yolk sac is the only source of nutrients for the developing embryo.
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| 8. | The immature ova originate from cells from the dorsal endoderm of the yolk sac.
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| 9. | The embryonic disc now lies between the amniotic cavity and the primary yolk sac.
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| 10. | It is aplacental viviparous, with the developing young drawing sustenance from a yolk sac.
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