+The **gastrula** is an early stage of [Embryo](/wiki/embryo) development, following the [Blastula](/wiki/blastula). During this pivotal phase, cells reorganize through gastrulation, forming the three primary germ layers from which all body tissues and organs will arise.
+## See also
+- [Gastrulation](/wiki/gastrulation)
+- [Germ Layers](/wiki/germ_layers)
+- [Embryology](/wiki/embryology)