The effect of transection of the duck blastoderm on the orientation of the embryo.

@article{Rogulska1968TheEO,
  title={The effect of transection of the duck blastoderm on the orientation of the embryo.},
  author={Teresa Rogulska},
  journal={Journal of embryology and experimental morphology},
  year={1968},
  volume={20 3},
  pages={
          237-45
        }
}
Von Baer (1828) formulated a rule according to which the cephalo-caudal axis is perpendicular to the long axis of the shell, and the head of the embryo is directed forwards when the egg is placed with the blunt end to the left. This law has been checked in several species of bird: hen, duck, pigeon, goose, turkey (see Clavert, 1960, for references) and quail (Fargeix, 1963, 1964). Embryos obeying von Baer's rule were found to constitute the most numerous class, but considerable interspecific as… CONTINUE READING

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