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amniote |
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amniote /am·ni·ote/ (am´ne-ōt) any member of the group of vertebrates that develop an amnion, including reptiles, birds, and mammals. amniote any animal with amnion. Patient discussion about amniote. Q. what does it mean when an ultrasound shows an empty amniotic sac and no baby? A. This exact thing happened with my friend who is now 22 weeks with her first baby. She had 2 additional sacs - both empty - and the doctor said that the pregnancy had probably started out as triplets but that only one of the embryos had actually established and continued to grow. Read more or ask a question about amnioteHer doctor said it is very common for a woman to have more than one egg fertilize but that in most cases the pregnancy continues as a singleton only. She told my friend that the empty sacs would just disappear through time (which they did) and that they posed no danger to her baby. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Our evolutionary roots--the
amniota-began a great divergence when a few amniotes crawled out of a
primordial sea and left their finned relatives behind. It is
probable that this better means of expelling carbon dioxide allowed
these creatures to become fully independent from the water and
contributed to the development of the amniote egg, which was integral to
the transition from amphibian to reptile. Casineria pulls back the origin of amniote lineages much
farther than was previously realized. |
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