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In eighteenth century Germany, Johann Friedrich Blumenbach studied how individuals within a species vary, and to explain such variations, he proposed…
AnthropologyAnatomy, ComparativeVariation (Biology)EmbryosDevelopmental BiologyEctoderm is one of three germ layers--groups of cells that coalesce early during the embryonic life of all animals except maybe sponges, and from…
EmbryosEmbryologyGastrulationCellsTissuesMesoderm is one of the three germ layers, groups of cells that interact early during the embryonic life of animals and from which organs and tissues…
MesodermGastrulationCell differentiationCellsTissuesEndoderm is one of the germ layers-- aggregates of cells that organize early during embryonic life and from which all organs and tissues develop.…
GastrulationEmbryosEmbryologyCellsTissuesA germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and…
GastrulationEmbryologyCell differentiationEmbryosCellsEtienne Geoffroy Saint-Hilaire, commonly known as Geoffroy, studied animals, their anatomy and their embryos, and teratogens at the National Museum…
Geoffroy Saint-Hilaire, Etienne, 1772-1844TeratologyZoologyFrench RevolutionHomology theoryFrederik Ruysch's cabinet of curiosities, commonly referred to simply as the Cabinet, was a museum Ruysch created in the Netherlands in the late…
OrganizationHuman AnatomyAnatomical museumsHuman anatomy--HistoryTissues--PreservationTooth enamel contains relics of its formation process, in the form of microstructures, which indicate the incremental way in which it forms. These…
EvolutionteethDental EnamelHuman EvolutionAnatomyHilde Proscholdt Mangold was a doctoral student at the Zoological Institute at the University of Freiburg in Freiburg, Germany, from 1920-1923.…
LiteratureEmbryosTrembley, Abraham, 1710-1784GastrulationEmbryologyFrederik 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, 1831-1904