Surgery & Orthopedics
History of Medicine Home > From 'Monsters' to Modern Medical Miracles Home > Embryology and Classification of Conjoined Twins Embryology of Conjoined Twins Identical twins develop when a single fertilized egg, also known as a monozygote, splits during the first two weeks of conception. Conjoined twins form when this split occurs after the first two weeks of conception. The monozygote does not fully separate and eventually develops into a conjoined fetus that shares one placenta, one amniotic sac, and one chorionic sac. Because the twins develop from a single egg, they will also be the same sex. The extent of separation and the stage at which it occurs determine the type of conjoined twin, i.e., where and how the twins will be joined.
History of Medicine Home > History Home > Opening Doors: Contemporary African American Academic Surgeons Home African Americans have always practiced medicine, whether as physicians, healers, midwives, or “root doctors.” The journey of the African American physician from pre-Civil War to modern day America has been a challenging one. Early black pioneer physicians not only became skilled practitioners, they became trailblazers and educators paving the way for future physicians, surgeons, and nurses, and opening doors to better health care for the African American community.