This book presents a synthesis of the modern approaches to the study of ontogeny and the interpretation of the fossil evidence for human origins. Recent years have seen significant developments in the understanding of the regulation of embryonic pattern formation and skeletal adaptation, and in techniques for the visualizations and analysis of ontogenetic transformations, offering the prospect of understanding the mechanisms underpinning phylogenetic transformation in the skeleton. Advances in developmental biology, molecular genetics, biomechanics, microscopy, imaging and morphometrics are brought to bear on the subject.