Archive image from page 160 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 J C Fig 78. A, B, and C. Diagrams to represent the effect of rotation of the embryo on the amniogenous somatopleure. a represents in all figures the position of the ectamnion on the left (lower) side; d represents in all figures the position of the ectamnion on the right (upper) side, h and c repre- sent the junction of amnion and body-wall on left and right sides respectively. In Fig. A, a-b and c~d are equal. In Fig. B, rotation of
Archive image from page 160 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 J C Fig 78. A, B, and C. Diagrams to represent the effect of rotation of the embryo on the amniogenous somatopleure. a represents in all figures the position of the ectamnion on the left (lower) side; d represents in all figures the position of the ectamnion on the right (upper) side, h and c repre- sent the junction of amnion and body-wall on left and right sides respectively. In Fig. A, a-b and c~d are equal. In Fig. B, rotation of the embryo is assumed to have taken place without formation of the amnion; the distance a-b has become greater than c-d. In Fig. C is represented rotation of the embryo with synchronous formation of the amniotic folds, as is actually the case; c-d is inevitably thrown into secondary folds. The vertical lines at the extreme right and left represent the margins of the pellucid area. if, during this process, there were actual independent growth of a-b and c~d, the latter would of necessity be thrown into folds, but not the former. Finally, if the amniotic folds were forming at the same time (as is actually the case), the right one would
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