| 1. | An amnion, chorion, and allantois are present during embryonic life.
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| 2. | In other words, the allantois takes no share in its formation.
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| 3. | Germ cells migrate from near the allantois and colonize the primordial gonads.
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| 4. | A very small allantois is found in modern amphibians.
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| 5. | Also, it is a common misconception that the allantois gives rise to the umbilical cord.
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| 6. | Tbx4 has been shown to be expressed in the allantois, hindlimb, lung and proctodeum.
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| 7. | Haeckel speculates that the allantois is formed in a similar way in both humans and other mammals.
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| 8. | The allantois ( 8 ) is a sac that collects the metabolic waste produced by the embryo.
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| 9. | The allantois regresses into the embryo to give rise to the urinary bladder and median umbilical ligament.
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| 10. | The first of these is the cranial portion which is continuous with the allantois and forms the bladder proper.
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