gastrulation

Gastrulation is a crucial early phase of embryo development in animals, including humans. During this process, the single-layered blastula transforms into a multi-layered structure called the gastrula. This involves the movement and rearrangement of cells, leading to the formation of three primary germ layers: the ectoderm, mesoderm, and endoderm. Each layer eventually develops into different tissues and organs in the body. Gastrulation sets the foundation for the organism's body plan, influencing everything from the skin and nervous system to muscles and internal organs.