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fetus |
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fetus) A ten-week-old fetus in its mother's womb (or uterus). Enclosed within its amniotic sac, and cushioned from sudden movements by amniotic fluid, the fetus receives its oxygen and nutrients via the umbilical cord from the placenta, which is embedded within the inner wall of the womb. ) Ultrasound scan of a 12 week-old fetus showing (from right) the head, an arm, the body, and a foot. Such scans are often taken at around the twelfth week of pregnancy to determine whether any obvious developmental abnormalities have occurred. Stage in mammalian embryo development after fusion of gametes produces a zygote cell. The human embryo is usually termed a fetus after the eighth week of development, when the limbs and external features of the head are recognizable. The stage ends at birth. |
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