![]() ![]() The blastopore itself introduces the first differentiation (after the establishment of the axis of the egg in the ovary, and of the plane of bilateral symmetry by the point of entrance of the sperm) in that it converts the single-layered hollow ball (blastula) into the double-layered bowl (gastrula). That is to say that it determines the place of formation of the various organs, and is necessary for the start of the processes of differentiation. Further, experimental investigations have shown that the region of the dorsal lip of the blastopore (which is the first part of the blastopore to develop) is responsible for organising the embryo. The blastopore is one of the most important structures in development, for as a result of the processes which are entailed in its formation the fundamental architecture of the future embryo is laid down. (More? Embryology History | Historic Embryology Papers) ![]() This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. Pages where the terms " Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication.
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