Studies of the Fetus in the Womb are two colored annotated sketches by Leonardo da Vinci made in around 1511. The studies correctly depict the human fetus in its proper position inside a dissected uterus. Leonardo depicted the uterus with one chamber, in contrast to theories that the uterus had multiple chambers which many believed divided fetuses into separate compartments in the case of twins. Leonardo also correctly drew the uterine artery and the vascular system of the cervix and vagina.