Reactions of embryonic tissues to a distributed and concentrated stretching are described and compared with the mechanics of the normal gastrulation movements. A role of mechanically stressed dynamic cell structures in the gastrulation, demarcation of notochord borders and in providing proportionality of the axial rudiments is demonstrated. A morphomechanical scheme of amphibian gastrulation is presented.
Keywords: Blastopore; Cell stretching; Embryonic movements; Gastrula; Xenopus laevis.
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