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By: Corinne DeRuiter, Maria Doty | Published: Jun 21, 2011

Gastrulation is an early stage in embryo development in which the blastula reorganizes into three germ layers: the ectoderm, the mesoderm, and the…

By: Maria Doty, Corinne DeRuiter | Published: Jun 21, 2011

A node, or primitive knot, is an enlarged group of cells located in the anterior portion of the primitive streak in a developing gastrula. The node…

By: Maria Doty | Published: Jun 10, 2011

August Antonius Rauber was an embryologist and anatomist who examined gastrulation in avian embryos. He examined the formation of the blastopore,…