The word "entoblast" refers to the inner layer of cells in the developing embryo that gives rise to the endoderm, which forms the lining of the digestive tract and associated organs. Synonyms for entoblast include endoderm, hypoblast, and endodermal layer. Other terms that are related to the development of the embryonic gut include ectoderm, which gives rise to the skin and nervous system, and mesoderm, which forms the muscles, bones, and blood vessels. Understanding these concepts is important for researchers in the fields of developmental biology and regenerative medicine, as they seek to unlock the mysteries of how cells differentiate and form complex tissues and organs.