The segregation and early migration of cranial neural crest cells in the avian embryo☆

Kathryn W. Tosney

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The segregation and early migration of cranial neural crest cells in the avian embryo☆

机译：禽胚胎中颅神经rest细胞的分离和早期迁移☆

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Thesegregationofneuralcrestcellsfromtheneuralfoldsandtheirearlymigrationalongthreecranialpathwaysintheavianembryohavebeendescribedontheultrastructurallevel.Majorfindingsarethefollowing:First,beforeneuralcrestsegregation,thebasallaminaunderlyingtheneuralfoldsundergoestemporalchangesindistributionthatcorrelatewithalterationsintissuegeometry.Second,althoughtheneuraltubealwaysbecomescontinuousatitslumenalsurfaceascrestcellssegregate,thetimeatwhichectodermfusesacrossthemidlinebearsnoconstanttemporalrelationshiptocrestsegregation.Third,aridgeonthedorsolateralneuroepitheliummayinhibitventralmovementofcrestcellsinthemesencephalon.Fourth,cranialcrestcellsorienttowardsurfaceswithanabundantextracellularmatrixorbasallamina.Mesodermalcellsdonotappeartoserveassubstrataformigration.Fifth,interstitialbodiesaremoreprominentalongthepathwaysofmigrationthanelsewhereintheembryo.Sixth,thedirectionoforientationofmatrixfibersalonganteriorcrestpathwaysisnormaltothedirectionofmigrationofcrestcellsandappearsnottoguidemigration.

机译：Thesegregationofneuralcrestcellsfromtheneuralfoldsandtheirearlymigrationalongthreecranialpathwaysintheavianembryohavebeendescribedontheultrastructurallevel.Majorfindingsarethefollowing：首先，beforeneuralcrestsegregation，thebasallaminaunderlyingtheneuralfoldsundergoestemporalchangesindistributionthatcorrelatewithalterationsintissuegeometry.Second，althoughtheneuraltubealwaysbecomescontinuousatitslumenalsurfaceascrestcellssegregate，thetimeatwhichectodermfusesacrossthemidlinebearsnoconstanttemporalrelationshiptocrestsegregation.Third，aridgeonthedorsolateralneuroepitheliummayinhibitventralmovementofcrestcellsinthemesencephalon.Fourth，cranialcrestcellsorienttowardsurfaceswithanabundantextracellularmatrixorbasallamina.Mesodermalcellsdonotappeartoserveassubstrataformigration.Fifth，interstitialbodiesaremoreprominentalongthepathwaysofmigrationthanelsewhereintheembryo.Sixth，thedirectionoforientationofmatrixfibersalonganteriorcrestpathwaysisnormaltothedirectionofmigrationofcrestcellsandappearsnott oguidemigration。

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《Developmental biology》 |1982年第1期|共页
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Kathryn W. Tosney;
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The segregation and early migration of cranial neural crest cells in the avian embryo☆

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