I have studied this topic extensively for my PhD at the Department of Engineering, University of Cambridge. A copy in .PDF format can be downloaded here:
PhD ThesisThis work was also published in the Journal of Biomechanics of which you can download a reprint:
J.Biomech publicationSnapshots of a movie are shown below, illustrating the change of shape of the fetal skull during the first stage of labour. Note that deformations are magnified with a factor 4.
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