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- W2053831990 abstract "The origin of the chordate central nervous system (CNS) is unknown. One theory is that a CNS was present in the first bilaterian and that it gave rise to both the ventral cord of protostomes and the dorsal cord of deuterostomes (reviewed in [1Arendt D. Denes A.S. Jékely G. Tessmar-Raible K. The evolution of nervous system centralization.Philos. Trans. R. Soc. Lond. B Biol. Sci. 2008; 363: 1523-1528Crossref PubMed Scopus (151) Google Scholar]). Another theory (reviewed in [2Holland N.D. Early central nervous system evolution: An era of skin brains?.Nat. Rev. Neurosci. 2003; 4: 617-627Crossref PubMed Scopus (174) Google Scholar]) proposes that the chordate CNS arose by a dramatic process of dorsalization and internalization from a diffuse nerve net coextensive with the skin of the animal, such as enteropneust worms (Hemichordata, Ambulacraria) are supposed to have [3Bullock T.H. Horridge G.A. Hemichordata.Structure and Function of the Nervous System of Invertebrates. W.H. Freeman, San Francisco1965Google Scholar]. We show here that juvenile and adult enteropneust worms in fact have a bona fide CNS, i.e., dense agglomerations of neurons associated with a neuropil, forming two cords, ventral and dorsal. The latter is internalized in the collar as a chordate-like neural tube. Contrary to previous assumptions, the greater part of the adult enteropneust skin is nonneural, although elements of the peripheral nervous system (PNS) are found there. We use molecular markers to show that several neuronal types are anatomically segregated in the CNS and PNS. These neuroanatomical features, whatever their homologies with the chordate CNS, imply that nervous system centralization predates the evolutionary separation of chordate and hemichordate lineages." @default.
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- W2053831990 date "2009-08-01" @default.
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- W2053831990 title "Centralization of the Deuterostome Nervous System Predates Chordates" @default.
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- W2053831990 doi "https://doi.org/10.1016/j.cub.2009.05.063" @default.
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