Answer Posted / Sachin Mishra

Gastrulation is a critical stage in embryonic development, during which the three primary germ layers—ectoderm, mesoderm, and endoderm—are established. Gastrulation begins with the involution of cells from the blastula's inner cell mass to form the primitive streak, a longitudinal structure along the posterior side of the embryo. These migrating cells will eventually give rise to the three germ layers. The ectoderm forms the outer layer of the embryo and develops into the nervous system, skin, and sensory organs; the mesoderm forms the middle layer and develops into bones, muscles, and connective tissues; and the endoderm forms the inner layer and develops into the lining of the digestive tract.

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