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Journal Article
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The neural crest and origin of the neurocranium in vertebrates.
Cranium of jawed vertebrates is composed of dorsal moiety that encapsulates the brain, or the neurocranium, and the is called the neurocranium, and the ventral moiety, the viscerocranium, that supports the pharynx. In modern jawed vertebrates (crown gnathostomes), the viscerocranium is predominantly of neural crest origin, and for the neurocranium, the rostral part is derived from neural crest cells, whereas the posterior part from the mesoderm. In the cyclostome cranium, the mesoderm/neural crest boundary of the neurocranium used to be enigmatic, let alone the morphological comparison of neurocranial between two cyclostome groups, lampreys and hagfishes. By examining the hagfish development it has become clear that cyclostomes share a common craniofacial embryonic pattern that is not shared by modern gnathostomes, and cyclostome cranium can be compared among the group as developmental modular units with comparable mesoderm/neural crest boundary within the neuroranium. Also, the dual origin of the jawed vertebrate neurocranium has now turned out to represent a derived condition, and ancestrally, the neurocranium would likely have been predominantly of mesodermal origin. Enlargement of the forebrain and reorganization of the oral apparatus seem to have led to the involvement of the neural crest in the rostral neurocranium.
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