syncytiotrophoblast

https://doi.org/10.1351/goldbook.11274

Outer syncytial layer of trophoblast cells that invades the endometrium during implantation.

Note: The syncytiotrophoblast is the site of synthesis of human chorionic gonadotropin and is involved in implantation.

Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 810 (https://doi.org/10.1515/pac-2015-1202)