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quadrupedal dinosaur palms

Previously their was some discussion on the palms in position of theropod dinosaurs' manus . I was wondering, if theropods palms faced inwards and the radius and ulna could not cross , what about the manus of quadrupedal dinosaurs...All reconstructions show that their hands were not in the palms in position, but the palms faced the posterior... is this correct?...and when did this change happen...or maybe the bending of the elbow into a semi sprawling gait made this position possible....?
meor hakif
university of malaya
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