During gastrulation, three germ layers are formed.
Gastrulation:
The process of gastrulation, during which the hollow ball of cells known as the blastula starts to differentiate into more specialized cells that get stratified over the growing embryo, is when the germ layers are formed.
One of the most important stages of development, gastrulation produces the three basic germ layers (ectoderm, endoderm, and mesoderm) and primes the system for organogenesis.
Each germ layer's cells undergo differentiation to become tissues and embryonic organs. The nervous system and the epidermis are two examples of tissues that develop from the ectoderm. The body's connective tissue and muscle cells are derived from the mesoderm.
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