Coloured SEM of the head of an 8 week human foetus

Coloured SEM of the head of an 8 week human foetus

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Foetal head. Coloured scanning electron micrograph (SEM) of the head of an eight week old human foetus. The foetus' eyes, nose and hands are visible. The eighth week of pregnancy represents the end of the formative developmental stage and the embryo becomes a foetus. It is human-like in appearance, with the head large in proportion to the body. The genital organs develop into male or female at 7 weeks. All major organ systems are formed by the eighth week, but require much growth. By eight weeks the foetus is about 3-4cm long (crown-rump length) and weighs under 10 grams. Magnification unknown.

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Keywords: 8 weeks, embryo, eye, fetus, finger, foetal head, foetus, hand, head, human body, nose

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