EDELMANN / SCIENCE PHOTO LIBRARY EDELMANN / SCIENCE PHOTO LIBRARY
The human foetus at about 12 weeks showing the head and upper limbs and the umbilical cord which connects the foetus (at the navel) to the placenta, a large organ embedded in the uterine wall that interfaces the foetal and maternal circulations, exchanging nourishment and waste products. Growth at this time is rapid: the head is still relatively large with a bulging forehead, the outer ear is formed, as are the nose & mouth; the eyes have migrated from the sides of the head, although the eyelids have not yet fully developed. The features of the upper - limbs wrist, hand and fingers - are advanced and developing at a faster rate than those of the lower limbs.
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