Dizygotic twims, 19th century illustration
Illustration of a female pelvis showing dizygotic twins in the uterus (womb). Dizygotic, or non-identical, twins develop when two separate eggs are released from the ovaries and are fertilised simultaneously. Often, as here, they are each contained in their own amniotic sac. From An Improved System of Midwifery, by Wooster Beach (1794-1868), published in 1851., Photo by NATIONAL LIBRARY OF MEDICINE/SCIENCE PHOTO LIBRARY
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