Week 16 Post Fertilization...
Growth continues, but no new structures form after this point.
HEAD
Eyes are at final destination and face forward rather than to the sides and reflexes, such as blinking, develop. Ears move to final position and stand out from head.
ABDOMEN
Meconium begins to accumulate in the bowels. Meconium is the product of cell loss, digestive secretion and swallowed amniotic fluid.
LIMBS
Fingertips and toes develop the unique swirls and creases of fingerprints and toe prints.
NERVOUS
The nerves are being coated with a fatty substance system (myelin) to speed nerve cell transmission and insulate them for uninterrupted impulses.
BLOOD
Circulation is completely functional. The umbilical cord system continues to grow and thicken as blood travels with considerable force through the body to nurture the fetus. The placenta is now almost equal in size to the fetus.
http://visembryo.com/baby/week16.html
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