鼻器の誘導, 特に前腦の誘導力持續限界とその特質性について

概要

論文の詳細を見る
The results of experiments reported here are concerned with two main problems, one to determine the range of age capable of induction of donor, and the other to find out the effect of position of the host embryo on the nature of the induced organs. The experiments were made by transplanting fore-brain at stages 16 to 42, according to OYAMA's table, into the blastocoel of gastrulae. This test was supplemented by experiments of regeneration after the removal of the nasal placode at stages from 29 to 37. The experimental results are summarized in tables 3 and 4 respectively. According to them, the fore-brain almost loses its inducing capacity at stage 35. Before this stage and, so far as the transplanted fore-brain holds its inducing capacity, the ectoderm in the heart region and abdomen responds to the stimuli with ear formation (A.B, B.B, C.B, in Fig. 2), while that in the head region, anterior to the normal ear, always with production of nose (D) (Table 2, Fig. 7). This regional difference of induction may be interpreted in terms of the field theory. However, the fact that a nose is produced also in the normal ear region (Fig. 2, a) indicates the specificity of the forebrain. Thus the determination of the character of induced organs is to be considered to be controlled by the reciprocal action of the inducer and the field.
社団法人日本動物学会の論文
1941-03-15