# yolk sac

> membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk

**Wikidata**: [Q369887](https://www.wikidata.org/wiki/Q369887)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Yolk_sac)  
**Source**: https://4ort.xyz/entity/yolk-sac


## References

1. Foundational Model of Anatomy
2. [Source](http://www.bartleby.com/107/11.html)
3. BabelNet
4. [Source](https://ncithesaurus.nci.nih.gov/ncitbrowser/)
5. [Source](https://encyklopedia.pwn.pl/haslo/zoltkowy-pecherzyk;4003112.html)
6. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)