THIERRY BERROD / SCIENCE PHOTO LIBRARY THIERRY BERROD / SCIENCE PHOTO LIBRARY
Foetal male sex organs. Triggered by sex hormones, this stage of sexual differentiation finishes in around the fourth month of pregnancy. What starts off as the genital tubercle (rounded), here expands into the penis and its head (glans). For the female equivalent, see clip K004/5615.
Model release not required. Property release not required.