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Th e uppe r on e is closel y relate d t o a larg e bloo d vesse l whic h lie s under - neat h th e nerve . Paraffi n section . Ç & Å stain . X 500 . vou s syste m an d t o gai n insigh t int o th e basi c mechanism s responsibl e for axon gli a interactio n an d thei r growt h behavior . Th e concep t of chemotropis m a s th e guidin g principl e of neura l organizatio n was firs t propose d b y Ramo n y Caja l befor e th e tur n of th e century . Althoug h th e concep t suffere d a sever e setbac k durin g th e earl y par t of th e century , th e ide a of axon-gli a interactio n a s a n essentia l developmenta l ste p ha s gaine d in - III .

ORGANIZATIO N O F TH E PERIPHERA L NERVOU S SYSTE M 41 dorsa l an d ventra l wall s of th e neura l tub e ar e thinne r tha n th e latera l region s of th e neura l tube . As th e neura l cres t cell s emerg e fro m th e neura l tub e in tandem , the y glid e ove r th e dorsolatera l surfac e of th e neura l tub e an d sho w n o evidenc e of affinit y wit h ectoder m an d somite . Th e cres t cell s migrat e alon g a narro w passag e be twee n th e neura l tub e an d somit e t o reac h th e paraxia l mesoder m (Fig .

Th e repulsio n betwee n neuroblast s wit h ectoder m an d th e sclerotome , an d th e affinit y betwee n neuroblast s wit h th e mesoderma l cell s an d bloo d vessels , appea r t o b e responsibl e for th e definitiv e cours e take n b y th e migrator y neuroblasts . Th e spina l gangli a ar e forme d jointl y b y neura l cres t an d supportin g meso derma l cells ; th e latte r wil l becom e futur e satellit e cells , neurolemm a cells , an d fibroblasts . Th e sensor y neuroblast s derive d fro m cres t cell s emi t centra l an d periphera l processes ; th e forme r grow s bac k t o th e neura l tub e an d th e latte r form s th e spina l nerve .

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