Neural Crest Development in Reptilian Embryos, Studied with Monoclonal Antibody, HNK- 1

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We report here early development of cranial and trunk neural crest, and migratory routes of HNK-1- immunoreactive cells in embryos of a primitive amniote, the softshell turtle. The cranial neural crest cells begin to emigrate shortly after the neural tube closure. It seems that the migratory timing of the cranial neural crest cells in the turtle is different from those of birds and mammals. Presence of two major migratory routes were found in the trunk : (1) a dorsolateral pathway between the epidermal ectoderm and somite ; (2) a ventral pathway between the anterior portion of dermomyotome and the sclerotome of each somite. Our results suggest that the trunk neural crest cells have characteristic mode of migration in development of amniotes including the turtle unlike that of teleosts and Xenopus. It is likely that ventrally migrating neural crest cells are the source of pigment cells of some extracutaneous tissues in the turtle embryo.
社団法人日本動物学会の論文
1994-06-15