title: [Patterns of mechanical stress at the successive stages of early development of frog].
abstract: The immediate relaxation deformations have been studied in the embryonic frog tissues from the late blastula stage till the early tail bud stage. As a result, the maps of mechanical stresses were constructed which were characterized by the existence of distinct tension-lines dissecting the embryonic tissues (cross-lines). A few discrete moments of development were established when new cross-lines formed or the previous ones disappeared; they are separated by the topologically invariant periods of development. The cross-lines play an important role in morphogenesis in that they determine the ways of active cell migration and trace the boundaries between different anlages. The orientation of the cross-lines coincides, as a rule, with the direction of predominant tension of tissues during the preceding topologically invariant period of development.
mesh_terms: D000818:Animals; D001001:Anura / Q000196:embryology*; D000013:Congenital Abnormalities / Q000209:etiology / Q000473:pathology; D009024:Morphogenesis; D013314:Stress, Mechanical; D013997:Time Factors
vernacular_title: Arkhitektura mekhanicheskikh napriazheniĭ na posledovatel'nykh stadiiakh rannego razvitiia liagushki