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Drei Keimblätter

Drei Keimblätter endoderm derives from the most vegetal blastomeres ectoderm from the most animal blastomers mesoderm from a middle set that contribute also to endoderm and ectoderm coloring in each picture is the more intense, the higher the proportion of cell progeny that will contribute to the given germ layer (L. Dale, Curr. Biol. 9:R812–R815, 1999.) Biologie für Physikerinnen und Physiker Kapitel VI Entwicklung 14

Blastula (=Keim) Stadium outermost regions of the embryo -> tight junctions between the blastomeres begin to create an epithelial sheet -> isolates the interior of the embryo from the external medium Molecular Biology of the Cell. 4th edition. Alberts B, Johnson A, Lewis J, et al. New York: Garland Science; 2002. Biologie für Physikerinnen und Physiker Kapitel VI Entwicklung 15