Ectoderm is one of the three primary germ layers in the very early embryo. The other two layers are the mesoderm (middle layer) and endoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer. It emerges and originates from the outer layer of germ cells. Ectoderm, the outermost of the three germ layers, or masses of cells, which appears early in the development of an animal embryo. Ectoderm definition, the outer germ layer in the embryo of a metazoan.

English dictionary definition of ectoderm. The outermost of the three primary. Outermost of the three tissue layers in the embryo of a metazoan animal. Through development , it will produce the epidermis ( skin ) and nervous system of the adult.
Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and. Start studying ectoderm, mesoderm, endoderm.
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