Title: chorionic sac
Long Title: IUPAC Gold Book - chorionic sac
DOI: 10.1351/goldbook.10518
Status: current

Definition
Outermost membranous sac that encloses the embryo in higher vertebrates (reptiles, birds, and mammals), lined by chorion.

Related Terms
- chorion: https://goldbook.iupac.org/terms/view/10516
- membranous: https://goldbook.iupac.org/terms/view/11555
- vertebrates: https://goldbook.iupac.org/terms/view/11367

Source
- PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 735 (https://doi.org/10.1515/pac-2015-1202)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/10518/html
- json: https://goldbook.iupac.org/terms/view/10518/json
- xml: https://goldbook.iupac.org/terms/view/10518/xml

Citation: Citation: 'chorionic sac' 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.10518
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.
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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: 2026-05-10T10:40:28+00:00