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How internal organs form

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.

Note:   The above text is excerpted from the Wikipedia article "How internal organs form", which has been released under the GNU Free Documentation License.
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