The Gastrulation Model

The Gastrulation Model describes a key stage in early embryonic development when the simple blastula transforms into a more complex structure called the gastrula. During this process, cells move inward to form three layers: ectoderm (outer layer), mesoderm (middle), and endoderm (inner). These layers will develop into different tissues and organs, such as skin, muscles, and internal organs. This model helps explain how a single fertilized egg gives rise to the diverse cells and structures necessary for a functioning body.