2023年5月30日 · The timeline of placental development illustrates how the placenta changes over the course of pregnancy. A crucial stage of placental development occurs when blood vessels in the lining of the uterus remodel, increasing the supply of blood to the placenta. This process, called spiral artery remodeling, is also illustrated in close-up.

Here, we review the morphological, molecular and functional aspects of human placental formation, with a focus on the defining cell of the placenta - the trophoblast."

2020年8月31日 · In general, once the fertilized egg implants in the uterine wall, the placenta begins forming. But the ball starts rolling several days before implantation. When you ovulate, …

2021年3月6日 · The placenta is a vital connecting organ between the maternal uterus and the foetus. It supports the developing foetus, in utero, by supplying nutrients, eliminating waste products of the foetus and enabling gas exchange via the maternal blood supply. In this article, we shall look at the development of the placenta.

The placenta’s initial development as an organ is complete by weeks 14–16 after fertilization. The placenta grows like an expanding disk. By week 20, the placenta covers half of the uterine wall and weighs about 200g. At term, it is about 700g and 20cm in diameter.

2023年5月1日 · The placenta is formed gradually during the first three months of pregnancy, while, after the fourth month, it grows parallel to the development of the uterus. Once completed, it resembles a spongy disc 20 cm in diameter and 3 cm thick. It is a temporary organ, whose genetic characteristics are identical to those of the developing child.

2019年11月27日 · Here, we review the morphological, molecular and functional aspects of human placental formation, with a focus on the defining cell of the placenta - the trophoblast.

Within 11 days of fertilization, the trophoblast forms two layers, 1st the cytotrophoblast and 2nd the syncytiotrophoblast, containing lacunae. The placenta forms a barrier to permit exchange of nutrients, gases and wastes with only slight mixing of fetal blood with maternal blood.

To outline development of the placenta elaboration of the villous trees the intrauterine environment during the first trimester establishment of the maternal circulation to the placenta To consider remodelling of the early placenta and formation of the smooth membranes

2021年4月22日 · By 18 to 20 weeks, the placenta is fully formed but continues to grow throughout your pregnancy. By 34 weeks pregnant, the placenta is officially considered “mature.” When …