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chorion
Embryology:
- outermost fetal membrane containing:
a) extraembryonic somatic mesoderm
b) trophoblast
c) chorionic villi (on maternal surface)
- the chorion becomes part of the definitive placenta as pregnancy progresses
General
embryonic structure
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999
Components
chorionic villi