Title: trilaminar embryo
Long Title: IUPAC Gold Book - trilaminar embryo
DOI: 10.1351/goldbook.11317
Status: current

Definition
Disc-like embryonic stage in which differentiation into three layers (endoderm, mesoderm, and ectoderm) has occurred.

Note
In the human embryo this occurs in the third week, following the onset of gastrulation.

Related Terms
- ectoderm: https://goldbook.iupac.org//terms/view/10632
- endoderm: https://goldbook.iupac.org//terms/view/10659
- gastrulation: https://goldbook.iupac.org//terms/view/10750
- mesoderm: https://goldbook.iupac.org//terms/view/10944

Source
- PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 815 (https://doi.org/10.1515/pac-2015-1202)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/11317/html
- json: https://goldbook.iupac.org/terms/view/11317/json
- xml: https://goldbook.iupac.org/terms/view/11317/xml

Citation: Citation: 'trilaminar 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.11317
License: 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.
Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .
Disclaimer: 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.
Accessed: 2026-06-21T04:58:02+00:00