Muscle (mesoderm) or possibly thyroid (endoderm). Transplanted to another region of the blastula where they will become Presumptive germ layers are interchangeable and that regions ordinarily destined to become, for example, brain (ectoderm), may be Of experimental procedures it is possible to demonstrate that these Layer of the blastula) suggests their fundamental similarity. Mesoderm are both derived originally from the ectoblast (outermost The distinction of germ layers, such as the ectoderm, mesoderm, and endoderm, is purely a matter of human convenience and is of no real concern to the embryo. In many forms (e.g., the frog) the third germ layer, or mesoderm, is formed almost simultaneously with the endoderm. The two layers to be distinguished are the ectoderm and the endoderm. The process varies considerably among the Vertebrates, but to a lesser extent when the process is compared in closely related species. It involves, but is independent of, mitosis. Gastrulation is that dynamic process in early development which invariably results in the transformation of a single-layered blastula stage to a didermic or 2-layered embryo. 1.5 Definition of the Major Processes of Gastrulation.1.3 Gastrulation as a Critical Stage in Development.Historic Disclaimer - information about historic embryology pages
(1951) The Blakiston Company.įrog Development (1951): 1 Introduction | 2 Rana pipiens | 3 Reproductive System | 4 Fertilization | 5 Cleavage | 6 Blastulation | 7 Gastrulation | 8 Neurulation | 9 Early Embryo Changes | 10 Later Embryo or Larva | 11 Ectodermal Derivatives | 12 Endodermal Derivatives | 13 Mesodermal Derivatives | 14 Summary of Organ Appearance | 15 Glossary | 16 Bibliography | Figures Book - The Frog Its Reproduction and Development. ייִדיש | Tiếng Việt These external translations are automated and may not be accurate. Google Translate - select your language from the list shown below (this will open a new external page)
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