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Photograph of a transvaginal ultrasound scan that reveals a single intrauterine gestational sac within the uterine cavity at 11 weeks gestational age (9 weeks after fertilization). The growing fetus can usually be seen to be surrounded by an “amnionic” membrane (thin white line circumscribing the fetus which ultimately will fuse with the outer chorionic membrane), the face can usually be appreciated, the brain continues to develop and many of the structures are defined, and fingers are often seen and can be counted.
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