10457 IUPAC Gold Book - bilaminar embryo 10.1351/goldbook.10457 10457 current synonym: bilaminar blastoderm 1 Early blastula having only two of the three primary germ layers that it will ultimately have; the two layers present are the cells of the epiblast that will give rise to the ectoderm and those of the hypoblast that will become the endoderm during gastrulation - both attached to a basement membrane before the mesoderm has formed. blastula https://goldbook.iupac.org/terms/view/10464 ectoderm https://goldbook.iupac.org/terms/view/10632 endoderm https://goldbook.iupac.org/terms/view/10659 epiblast https://goldbook.iupac.org/terms/view/10664 gastrulation https://goldbook.iupac.org/terms/view/10750 germ layers https://goldbook.iupac.org/terms/view/10763 hypoblast https://goldbook.iupac.org/terms/view/10829 mesoderm https://goldbook.iupac.org/terms/view/10944 PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 729 (https://doi.org/10.1515/pac-2015-1202) https://goldbook.iupac.org/terms/view/10457/html https://goldbook.iupac.org/terms/view/10457/json https://goldbook.iupac.org/terms/view/10457/plain Citation: 'bilaminar embryo' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.10457 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-10T11:21:43+00:00