👉 Phthisiogenesis is a process in which cells develop from a single cell. This process occurs during embryonic development, and it involves the formation of three different types of cells: epithelial, mesenchymal, and myogenic. The epithelial cells form the outermost layer of the developing embryo, while the mesenchymal cells give rise to other cells such as bone marrow fibroblasts, which later contribute to blood vessels and connective tissues. Finally, the myogenic