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This Concept Map, created with IHMC CmapTools, has information related to: Module 3 - Gastrulation, gastrulation which moves the dorsal mesoderm to the top of the blastocoel, ectoderm cells on the animal pole spread and extends over the embryo so that a second set of bottle cells form and move into the embryo, three germ layers they become second layer becomes mesoderm, three germ layers they become first cells become endoderm, What are the goals of gastrulation, and how are they accomplished? in Chickens, noggin binds BMP, the concentration specifies the type of mesoderm high concentrations form the organizer, the concentration specifies the type of mesoderm low concentrations form ventral mesoderm, primitive streak (midline thickening of the epiblast) determines axes of the embryo, cortical rotations that occur opposite of Sperm entry point, What are the goals of gastrulation, and how are they accomplished? in Frogs, invagination at the same time ectoderm cells on the animal pole spread and extends over the embryo, Chickens have extra-embryonic membranes (similar to humnas, gradient across the endoderm where the concentration is highest in the dorsal region, Notocord signaling the begining of Neurulation, three germ layers they become the last cells become ectoderm, a second set of bottle cells form and move into the embryo creating the ventral lip, invagination in the blastocoel, the first cells that invaginate from the endoderm cells that are between the endoderm and ectoderm become mesoderm, a primitive groove in which cells move toward the streak and invaginate