DOPAMINE / SCIENCE PHOTO LIBRARY DOPAMINE / SCIENCE PHOTO LIBRARY
Embryo at six weeks. At this stage of development, the embryo measures 1.5 centimetres in length and has paddle-like limbs with fingers and toes forming. The eyes (black) are now pigmented. The embryo floats in an amniotic sac, attached to the placenta by an umbilical cord (centre left). Nutrients and oxygen pass from the mother to her embryo through the umbilical cord, while waste products travel in the opposite direction. After eight weeks of development the embryo will be called a foetus.
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