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- W2044809328 abstract "The vertebrate peripheral nervous system (PNS) consists of two groups of nerves that have a metamerical series of proximal roots along the body axis: the branchial and spinal nerves. Spinal nerve metamerism is brought about by the presence of somites, while that of the branchial nerves is, in part, intrinsic to rhombomeres, the segmental compartments of the hind-brain. As the distribution pattern of neural crest cells prefigures the morphology of the PNS, we constructed tissue-recombinant chick embryos in order to determine factors that might regulate the crest cell distribution pattern. When the segmental plate was transplanted between the hind-brain and the head mesoderm before crest cell emigration, it developed into ectopic somites that inhibited the dorsolateral migration of crest cells such that formation of the cranial nerve trunks was disturbed. Even so, proximal portions of the nerve roots were intact. An ectopic graft of lateral mesoderm did not inhibit the directional migration of the crest cells, but allowed their ectopic distribution, resulting in the fusion of cranial nerve trunks. When spinal neurectoderm was transplanted into the hind-brain, the graft behaved like an even-numbered rhombomere and caused the fusion of cranial nerve roots. The identity of the spinal neurectoderm was preserved in the ectopic site analyzed by the immunolocalization of Hoxb-5 protein, a spinal cord marker. We conclude that the spatial distribution of cephalic crest cells is regulated by successive processes that act on their proximal and distal distribution. The migratory behavior of crest cells is achieved partly by an embryonic environment that is dependent upon the presence of somitomeres, which do not epithelialize as somites, in the trunk." @default.
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- W2044809328 date "1995-12-01" @default.
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- W2044809328 title "Patterning of the cranial nerves in the chick embryo is dependent on cranial mesoderm and rhombomeric metamerism" @default.
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- W2044809328 doi "https://doi.org/10.1046/j.1440-169x.1995.t01-5-00010.x" @default.
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