English: 1. The embryo turns on its left side. 2. The anterior head region develops further in the same direction, whereas the rest of the body develops oppositely. 3. Bilateral symmetry is regained, but with the anterior head turned around. Note, that the heart (and other organs) retain their original orientation, as there is no evolutionary pressure for internal symmetry.
This biology image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}. It is recommended to name the SVG file “AxialTwistSchema.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.
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Captions
Schema of the development of an axial twist in vertebrates.