EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The human embryo after about 2 months development, showing the arm & hand, & to the right the umbilical cord carrying 2 ateries & 1 vein to the placenta, an organ implanted into the uterine wall (endometrium) which exchanges nourishment & waste products with the maternal circulation. The arms appear on the body around the 24th day (the legs appear 2 days later, leg growth lagging behind that of the arms even in the postnatal infant).
Model release not required. Property release not required.