In animal development, organogenesis is the process by which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism.
The germ layers in organogenesis differ by three processes: folds, splits, and condensation.
Developing early during this stage in chordate animals are the neural tube and notochord.
Vertebrate animals all differ from the gastrula the same way.
Vertebrates develop a neural crest that differentiates into many structures, including some bones, muscles, and components of the peripheral nervous system.
The coelom of the body forms from a split of the mesoderm along the somite axis.
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