Physics of vortices in vertebrate embryo development. Experimental evidence and models.

The broken symmetry (hyperbolic) is propagated to all scales, until it is visible on the final animal body.
On many taxons, the windings are clearly visible, as for example here, on a direct frog (courtesy of Prof. Richardson).
The pelvis shows a very clear "long ranged" winding, which can hardly be described by a succession of genetic inductions.
Between closely related animals, as for example a chimpanzee and a man, one notices an increase of the winding.
On a stegosaure pelvis, one notices a long bony tip, which is nothing but a hydrodynamic plume, as classical in hydrodynamics.
Examples of hydrodynamic plumes in the Rayleigh-Bénard instability. from the site http://www.lbmethod.org/numerics:rb_2d.
Such a hydrodynamic plume is visible on a young chicken embryo, before the formation of the legs.
End of vortex explanations The quotation page : "Were it not for the kangourou, men would never had known they lacked a marsupial pouch", Alexandre Vialatte.
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