A human gastrula is composed of three cell layers stacked on top of one another (like the layers of a sandwich). As the early cells within human embryos are incapable of migration, this tri-laminar disc is the result of mitotic cell division and not the active movement of cells.

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The formation of the three cell layers in a human gastrula involves not only mitotic cell division but also the active migration of cells. This process, known as gastrulation, involves significant cell movement to form the ectoderm, mesoderm, and endoderm layers.

A Human Gastrula Is Composed of Three Cell Layers Stacked