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Video commentary excerpt
Let's recall that the symmetry study is always appreciated in comparison with the PSM. This is since the different embryological structures form around it.
We appreciate face-on the different symmetry plans of the different structures, in a physiological case these plans are more or less parallel to each other and thus perpendicular to the PSM (the virtual line of verticality of the body, we see it going from the bottom to the top center of the image) ...