Page 31 - SONO 260 THE FIRST TRIMESTER
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                                                                                             ž The developing placenta may be noted at the end of first trimester as a well-defined, crescent-shaped homogenous mass of tissue, along the margins of the gestational sac.
ž The placenta is formed by the decidua basalis, the maternal contribution of the placenta, and the chorion frondosum, the fetal contribution.
ž The umbilical cord is visible during the later half of the first trimester as a tortuous structure connecting the fetus to the developing placenta.
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