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TeachMeFinance.com - explain Germ layers Germ layers The term 'Germ layers' as it applies to the area of stem cell research can be defined as 'After the blastocyst stage of embryonic development, the inner cell mass of the blastocyst goes through gastrulation, a period when the inner cell mass becomes organized into three distinct cell layers, called germ layers. The three layers are the ectoderm, the mesoderm, and the endoderm'. Previous 5 Terms: geothermometer gerascophobia geratology gerenuk Germ cell Next 5 Terms: Germ line Germ line gene therapy Germicide gerocomy gerontogenous About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.