DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Human foetal hand. Light micrograph of a hand from a human foetus, showing the bones (yellow), cartilage and muscles (red) of the phalanges (fingers and thumb). Bones begin to appear in the third month of foetal development, though they are soft cartilage to begin with, later replaced by bone tissue.
Model release not required. Property release not required.