The “Organization Center” of the Amphibian Embryo: Its Origin, Spatial Organization, and Morphogenetic Action*

摘要: Publisher Summary This chapter discusses the origin, organization, and morphogenetic action of amphibian embryo. The gastrula is dynamically determined in its constituent parts. Transplantation upper blastoporal lips taken from gastrulae different ages demonstrated that head inductor located dorsal lip early gastrula, trunk advanced, finally tail completed gastrula. movements do not take form a wandering individual cells but are expression supracellular phenomenon. Dorsal marginal zone plays leading role embryo formation region called organization center phases cleavage blastocoel were considered as relatively unimportant though indispensable preparations for true events gastrulation formation. several important happen prior to gastrulation, which utmost significance embryogenesis.