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In 1868 in England, Charles Darwin proposed his pangenesis theory to describe the units of inheritance between parents and offspring and the…
HeredityDarwin, Charles, 1809-1882ReproductionEvolutionNatural selectionParasitic twins, a specific type of conjoined twins, occurs when one twin ceases development during gestation and becomes vestigial to the fully…
Twins, ConjoinedReproductionFetusCongenital DisordersHuman DevelopmentFor Thomas Hunt Morgan clarity was of utmost importance. He was therefore frustrated with the many disparate, disconnected terms that were used to…
Morgan, Thomas Hunt, 1866-1945RegenerationRoger Wolcott Sperry studied the function of the nervous system in the US during the twentieth century. He studied split-brain patterns in cats and…
Split brainCorpus callosumEpilepsySplit-Brain ProcedureNeuronsJames Marion Sims developed a treatment for vesico-vaginal fistulas in Montgomery, Alabama in the 1840s. Vesico-vaginal fistulas were a relatively…
TechnologySpeculum (Medicine)Fistula, Vesico-vaginalSurgeryGynecologyEugen Steinach researched sex hormones and their effects on mammals in the late nineteenth and early twentieth centuries in Europe. He experimented…
Hormones, SexGenerative organsGenital OrgansGonadal Steroid HormonesTesticular HormonesFrederik Ruysch, working in the Netherlands, introduced the term epithelia in the third volume of his Thesaurus Anatomicus in 1703. Ruysch created…
EpitheliumRuysch, Frederik, 1638-1731AnatomyCells--MorphologyHis, Wilhelm, 1831-1904As of 2021, twenty-eight US states have informed consent laws for abortion, which is a medical procedure to terminate pregnancy, often called Women’s…
AbortionAbortion, InducedInduced AbortionInformed ConsentGynecologyThroughout history many different methods have been devised for the early detection of pregnancy. From the time of the Ancient Egyptians, inspection…
Pregnancy TestsReproductionFertilityJan Evangelista Purkyne, also called Johannes or Johann Evangelist Purkinje, studied cells in the cerebellum, fibers of the heart, subjective visual…
Purkinje CellsPurkinje FibersOocytes