Embryonic Structure
chorionic villi
Subclass of:
Placenta; Chorion
Definitions related to chorionic villi:
  • 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).
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (chorionic villus) Tiny vascular tissue projections from the membranous sac that surrounds the embryo.
    NCI
    U.S. National Cancer Institute, 2021
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