The three primary germ layers in embryonic development are ectoderm, mesoderm, and endoderm. These layers give rise to various tissues and organs in an organism. The ectoderm develops into the nervous system, skin, and hair, while the mesoderm forms muscles, bones, and the circulatory system. Meanwhile, the endoderm generates the lining of the digestive and respiratory systems, along with other internal organs. Understanding these germ layers provides critical information about developmental biology and helps researchers study congenital defects, tissue engineering, and regenerative medicine, laying the groundwork for advances in healthcare.