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Ectoderm is one of three germ layers--groups of cells that coalesce early during the embryonic life of all animals except maybe sponges, and from…
EmbryosEmbryologyGastrulationCellsTissuesThe spinal column is the central structure in the vertebrate body from which stability, movement, and posture all derive. The vertebrae of the spine…
Congenital, Hereditary, and Neonatal Diseases and AbnormalitiesReproductionVertebratesCongenital DisordersA 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 theoryEarly in the process of development, vertebrate embryos develop a fold on the neural plate where the neural and epidermal ectoderms meet, called the…
VertebratesdevelopmentGerm LayersNeural CrestNeural Crest CellsEndoderm is one of the germ layers-- aggregates of cells that organize early during embryonic life and from which all organs and tissues develop.…
GastrulationEmbryosEmbryologyCellsTissues