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Craniofacial development is a complex, multistep process that begins with inductive interactions influencing neural and neural crest development, followed by epithelial-mesenchymal interactions that govern outgrowth, patterning, and skeletal differentiation. Unique to higher vertebrates, the cranial neural crest forms skeletal structures, including membrane bone and secondary cartilage, which are primarily found in the head, except for the clavicle. Additionally, the musculature of the head differs from that of the body; while body and tongue muscles originate from segmented epithelial somites, head musculature arises from unsegmented paraxial and prechordal mesoderm. The signaling pathways regulating myogenic differentiation are also distinct, as indicated by gene expression and myogenic cell responses to growth factors. Furthermore, neurogenic placodes, responsible for sensory organs and some cranial ganglia, are exclusive to the head. Recent advancements in understanding the molecular processes governing craniofacial development in various animal models have shed light on the genes involved from the initial induction of the head to the final differentiation stages.
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Craniofacial development, Philippa H. Francis-West
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- Année de publication
- 2003
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