Describe the process of placenta formation
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With the beginning of the process of gestation, placental stem cells are formed. These are known as progenitor cytotrophoblast cells. These cells differentiate, or change, to form the placenta. Some of the cells form the outer layer of the placenta while others form the inner layer. The outer layer cells turn into a form of epithelium, almost like skin cells, that function to transport gases, nutrients, and wastes.
They also make hormones that guide fetal, placental, and maternal systems throughout the pregnancy. The cells begin penetrating the lining of the uterus to connect the blood supply of the mother. The inner layer of stem cells turn into arteries and muscle cells that later form uteroplacental arteries and veins that will connect the blood supply of the mother to that of the fetus. By three weeks after fertilization, the first evidence of blood circulation from the mother to the fetus can be detected.
They also make hormones that guide fetal, placental, and maternal systems throughout the pregnancy. The cells begin penetrating the lining of the uterus to connect the blood supply of the mother. The inner layer of stem cells turn into arteries and muscle cells that later form uteroplacental arteries and veins that will connect the blood supply of the mother to that of the fetus. By three weeks after fertilization, the first evidence of blood circulation from the mother to the fetus can be detected.
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