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Craniofacial levels of skull development. The lines connecting the origin schematically indicate the hypothesized (Buschang et al. 1983; Enlow & Hans, 1996) differences in maturation of the various craniofacial levels; they do not imply ontogenetic shape trajectories, which would be multivariate and curvilinear. The temporal sequence of morphological maturation shows that the neurobasicranial complex reaches adult shape earlier than the ethmomaxillary complex and the mandible.
