https://wikimd.org/index.php?action=history&feed=atom&title=Placenta 2026-04-26T02:12:25Z Revision history for this page on the wiki MediaWiki 1.44.2 https://wikimd.org/index.php?title=Placenta&diff=4968835&oldid=prev 2023-09-18T16:15:49Z

<p></p> <p><b>New page</b></p><div>Placenta is an organ formed in the [[uterus]] during [[pregnancy]] that links the [[blood]] of the [[mother]] to the [[blood]] of the [[fetus]].<br /> [[File:Placenta timeline.jpg|alt=Placenta timeline|thumb|Placenta timeline]]<br /> == Purpose ==<br /> Placenta is the organ that provides the [[fetus]] with [[nutrients]] and removes [[waste]].<br /> [[File:Placenta.svg|Placenta|thumb|left]] <br /> [[File:Placenta accreta.png|Placenta accreta|thumb]]<br /> == Development ==<br /> Between Weeks 0 and 13, the fertilized blastocyst embeds in the uterine wall, and development of the fetus and placenta begin. At this time, the placenta is a relatively low-oxygen environment. Placental villi are lined with cells known as cytotrophoblasts and syncytiotrophoblasts. The cytotrophoblasts breach the uterine wall and begin reshaping blood vessels there. These remodeled vessels become a source of maternal blood for the placenta. The placenta develops to bring oxygen and nutrients to the fetus and to move harmful waste and nutrients away. Over time, the villi develop increasingly dense branching to accommodate the increased demand of the developing fetus.<br /> <br /> == Reshaping of spiral arteries ==<br /> [[File:Placenta invasion.jpg|alt=Placenta invasion|thumb|Placenta invasion]]<br /> Spiral arteries in the uterine wall are remodeled to supply blood to the fetus during pregnancy. When there is no pregnancy, the spiral artery spans the tissue of the uterine wall, supplying blood to the lining. In a normal pregnancy, cytotrophoblast cells from placental villi invade the space around the spiral artery, replacing cells which normally line the vessel.<br /> <br /> == Also see ==<br /> [[Placenta previa]] - a problem of pregnancy in which the placenta grows in the lowest part of the [[uterus]] and covers all or part of the opening to the [[cervix]].<br /> {{Extraembryonic and fetal membranes}}<br /> {{Development of circulatory system}}<br /> {{stub}}<br /> [[Category:Vertebrate developmental biology]]<br /> [[Category:Embryology of cardiovascular system]]<br /> [[Category:Organs (anatomy)]]<br /> [[Category:Reproductive system]]<br /> [[Category:Microbiomes]]<br /> [[Category:Human female endocrine system]]</div>

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