Gastrulation Amphibians
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Gastrulation is the stage in the early embryonic development of most animals, during which the blastula (a single-layered hollow sphere of cells), or in...- knot) is the organizer for gastrulation in most amniote embryos. In birds it is known as Hensen's node, and in amphibians it is known as the Spemann-Mangold...
- development of the embryo. Cell movements during amphibian gastrulation In frog embryos, gastrulation initiates at the site identified as the gray crescent...
- internal cavity of the primitive gastrointestinal tract that forms during gastrulation in a developing animal embryo. It develops into the endoderm and mesoderm...
which is the organizer for gastrulation. In birds, including the chick, this organizing node is called Hensen's node. In amphibians, where it was first identified...
Ectoderm (category Gastrulation)1828. The ectoderm can first be observed in amphibians and fish during the later stages of gastrulation. At the start of this process, the developing...
Ontogeny (section Gastrulation)of an organism happens through fertilization, cleavage, blastulation, gastrulation, organogenesis, and metamorphosis into an adult. Each species of animal...
animal pole. Gastrulation Embryogenesis Gilbert SF. Developmental Biology. 6th edition. Sunderland (MA): Sinauer Associates; 2000. Early Amphibian Development...
Blastocoel (section In amphibians)development, amphibian gastrulation, the blastocoel is displaced by the formation of the archenteron, during mid-gastrulation. At the end of gastrulation, the...
Epiboly (category Gastrulation)describes one of the five major types of cell movements that occur in the gastrulation stage of embryonic development of some organisms. Epiboly is the spreading...
Vegetal rotation (category Gastrulation)mesoderm internalization during gastrulation in amphibian embryos. The internalization of vegetal cells prior to gastrulation was first observed in the 1930s...
Vertebral column (section Fish and amphibians)Somite formation begins around the third week when the embryo begins gastrulation and continues until all somites are formed. Their number varies between...
Koller's sickle (category Gastrulation)In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast...
develops into a structure called a gastrula through a process called gastrulation. The gastrula then undergoes further development, including the formation...
stages of mid-gastrulation. The mouse allantois appears before the first somite pair as well; however, it occurs shortly after gastrulation. In both pigs...
Notochord (section In amphibians and fish)Embryos of modern vertebrates form transient notochord structures during gastrulation. The notochord is found ventral to the neural tube. Notogenesis is the...- Convergent extension (section In amphibians and fish)well as other amphibian, gastrulation serves as an excellent example of the role of convergent extension in embryogenesis. During gastrulation in frogs, the...
continue its development through the next stages of gastrulation, neurulation, and organogenesis. Gastrulation is the formation of the three germ layers that...
The blastocoel also allows blastomeres to move during the process of gastrulation. In Xenopus embryos, the blastula is composed of three different regions...
specification begins during cleavage in many animals or in the epiblast during gastrulation in birds and mammals. After transport, involving passive movements and...
- process for themselves. Fig. 10. Successive Stages in the Cleavage and Gastrulation of Amphioxus. A, one cell; B, two cells; C and D, four cells; E, eight
- eventually the placenta will take over the job of producing progesterone. Gastrulation and Formation The embryoblast within the blastocyst forms 3 primary germs