DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Eight week old foetus. Hand holds an aborted human foetus, eight weeks old. 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. Eyes, ears and nose are developing. The limbs are long and bent at the elbows and knees, and the fingers and toes have differentiated. The genital organs develop into male or female at 7 weeks. All major organ systems are formed by the eighth week, but require growth. The umbilical cord is prominent. By eight weeks the foetus is about 3-4cm long (crown-rump length) and weighs under 10 grams.
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