| umls-concept:C0008508 | skos:definition | MSH: The threadlike, vascular projections of the chorion. Chorionic villi may be free or embedded within the DECIDUA forming the site for exchange of substances between fetal and maternal blood (PLACENTA).,NCI: Tiny vascular tissue projections from the membranous sac that surrounds the embryo. | lld:umls |
