The umbilical cord connects the baby to the placenta during pregnancy. It is made up of two arteries and one vein. The arteries carry oxygenated blood from the mother to the fetus while the vein carries deoxygenated blood back to the mother.
The umbilical cord is usually cut when the baby is born. It connects the placenta to the baby. After birth, the cord is usually wrapped around the baby’s neck and tied off. This is called a “knot.”
The umbilical cord is the connection between the baby and the placenta. It is composed of two arteries and one vein. The umbilical artery carries oxygenated blood from the mother to the fetus while the umbilical vein carries deoxygenated blood back to the placenta. The umbilical vein is connected to the fetal heart via the yolk sac. The umbilical cord is attached to the placenta at its base.
The placenta is the organ that connects the developing embryo to the uterus. It is responsible for providing nutrition and oxygen to the fetus. The placenta is formed after implantation of the blastocyst into the endometrium. The placenta grows throughout pregnancy until birth.
The yolk sac is a temporary structure that develops during early embryonic development. It provides nourishment to the embryo before the chorion forms. After the chorion forms, the yolk sac degenerates.
The chorion is a protective membrane covering the embryo. It is derived from the trophoblast cells of the blastocyst. The chorion is the outermost layer of the zona pellucida.
The zona pellucidia is a thin layer of extracellular matrix surrounding the pre-implantation embryo. It consists of glycoproteins and proteoglycans.
The blastocyst is the stage of embryogenesis where the inner cell mass (ICM) and trophectoderm begin to differentiate. The ICM gives rise to the embryo proper, whereas the trophectoderm differentiates into extraembryonic membranes. The blastocyst contains about 100 cells.
The embryo proper is the group of cells that develop into the individual members of the organism. The embryo proper begins to form around the morula stage.