Fullterm Placenta

At full term, the placenta is discoid with a diameter of 15 to 25 cm, is approximately 3 cm thick, and weighs about 500 to 600 g. At birth, it is torn from the uterine wall and, approximately 30 minutes after birth of the child, is expelled from the uterine cavity After birth, when the placenta is viewed from the maternal side, 15 to 20 slightly bulging areas, the cotyledons, covered by a thin layer of decidua basalis, are clearly recognizable (Fig. 6.14B). Grooves between the cotyledons are formed by decidual septa.

Cotyledons Placenta

Figure 6.12 A 23-week-old fetus in the uterus. Portions of the wall of the uterus and the amnion have been removed to show the fetus. In the background are placental vessels converging toward the umbilical cord. The umbilical cord is tightly wound around the abdomen, possibly causing abnormal fetal position in the uterus (breech position).

Figure 6.12 A 23-week-old fetus in the uterus. Portions of the wall of the uterus and the amnion have been removed to show the fetus. In the background are placental vessels converging toward the umbilical cord. The umbilical cord is tightly wound around the abdomen, possibly causing abnormal fetal position in the uterus (breech position).

The fetal surface of the placenta is covered entirely by the chorionic plate. A number of large arteries and veins, the chorionic vessels, converge toward the umbilical cord (Fig. 6.14A). The chorion, in turn, is covered by the amnion. Attachment of the umbilical cord is usually eccentric and occasionally even marginal. Rarely, however, does it insert into the chorionic membranes outside the placenta (velamentous insertion).

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Responses

  • Carolyn
    What is a full term placenta?
    5 years ago

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