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A baby goes through several stages of development, beginning as a fertilized egg. The egg develops into a blastocyst, an embryo, then a fetus. ... Development of the Blastocyst ... Development of the Fetus and Placenta...
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www.merck.com/mmhe/sec22/ch257/ch257c.html
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1: Conception and Prenatal Development: Placenta and embryo at about 11 4⁄7 wk gestation. ). When the sac is formed and the blastocyst cavity closes (by about 10 days), the conceptus is considered an embryo.
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www.merck.com/mmpe/sec18/ch258/ch258a.html
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Indeed, ultrasonography and the possibility of surgical intervention have been partly responsible for the resurgence of interest in placental pathology. Discussions of ultrasound examination and fetal surgery, as well as the development of the placenta, are beyond the intended scope of this article.
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www.aafp.org/afp/980301ap/yetter.html
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In addition to its primary goal of facilitating transport between mother and fetus, the placenta is also a major endocrine organ. In almost all mammals the placenta synthesizes and secretes steroid hormones - progestins and estrogens. ... Implantation and Development of the Placenta: Introduction and Index...
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www.vivo.colostate.edu/hbooks/pathphys/reprod/placenta/...
www.vivo.colostate.edu/hbooks/pathphys/reprod/placenta/index.html
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UNSW Embryology program, education, human embryology, embryology, foetal development, foetus, development, reproduction, human development, placenta, placental development, placental vessels, placental vein, placental artery, Wharton's jelly, histiotrophic nutrition, hemotrophic nutrition, allantois, umbilical vein, ...
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embryology.med.unsw.edu.au/Notes/placenta.htm
embryology.med.unsw.edu.au/Notes/placenta.htm
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Placenta - Wikipedia, the free encyclopedia
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The placenta is an organ unique to mammals that connects the developing fetus to the uterine wall. The placenta supplies the fetus with oxygen and food, and allows fetal waste to be disposed via the...
en.wikipedia.org/wiki/Placenta
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How important is the placenta during your unborn baby's development? Consider that biologists classify humans as "placental mammals" and you'll get an idea. Without it, your baby could not survive.
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family.go.com/parentpedia/pregnancy/baby-development/pl...
family.go.com/parentpedia/pregnancy/baby-development/placenta/
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Development of the placenta is a highly regulated process that is essential for normal fetal growth and development, and for maintenance of a healthy pregnancy. The placenta fulfills several critical roles as the interface between mother and fetus: p ... The progenitor villous trophoblast cell is the stem cell of the placenta.
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www.uptodate.com/patients/content/topic.do?topicKey=~3N...
www.uptodate.com/patients/content/topic.do?topicKey=~3Nys8VcJdDhaLB
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These results indicate that tissues of trophectoderm origin are unable to restore genomic imprints and suggest that mechanisms that safeguard imprinting might be more robust in the embryo than in the placenta.
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www.medscape.com/medline/abstract/15240554
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