Fetus, 16 weeks


The human fetus at about four months showing the head, upper limbs, and the umbilical cord which connects the fetus (at the navel) to the placenta. The placenta is a large organ embedded in the uterine wall that interfaces the fetal 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 & fingers - are advanced and developing at a faster rate than those of the lower limbs.

Credit: Nestle / Petit Format / Science Source

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