Gastrulation takes place after cleavage and the formation of the blastula. Formation of the primitive streak is the beginning of gastrulation. It is followed by organogenesis—when individual organs develop within the newly-formed
Where is gastrula found?
The primitive streak is formed at the beginning of gastrulation and is found at the junction between the extraembryonic tissue and the epiblast on the posterior side of the embryo and the site of ingression.
Does gastrulation only occur in animals?
Although the details of gastrulation differ between various groups of animals, the cellular mechanisms involved in gastrulation are common to all animals. Gastrulation involves changes in cell motility, cell shape, and cell adhesion.
