Induction of Pharynx by Nerve-Cordless Prepharyngeal Tissue Graft in Planaria(Developmental Biology)

概要

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The prepharyngeal body pieces experimentally deprived of nerve cords were homoioplastically transplanted into the postpharyngeal region, in order to examine the necessity of the nerve cords of the graft for the pharyngeal induction in freshwater planarians. The grafts deprived of two nerve cords, the grafts X-irradiated and denervated, and the grafts taken from nerve-cordless median region, -all these three types of grafts induced the additional pharynges in considerable incidences of cases, though the degree of growth and tissue differentiation of the induced pharynges was less than that in the control graft bearing intact nerve cords. In each case, a new tissue appeared between the host and the graft and the outgrowth of the graft took place, but these phenomena had no direct relation with the pharyngeal induction, because even in the transplantation of the nervecordless median body piece in which these phenomena did not occur except only faintly, the pharynges were induced in a number of cases. From these results, it was concluded that the nerve cords of the graft were not primarily concerned with the pharyngeal induction but accelerated the growth and tissue differentiation of induced pharynges perhaps through the general trophic influence.
社団法人日本動物学会の論文
1985-08-15