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chorion is a topic covered in the Taber's Medical Dictionary.

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(kōr′ē-on″ )

[Gr. chorion, membrane (surrounding the fetus)]
An extraembryonic membrane that, in early development, forms the outer wall of the blastocyst. It is the thicker, outer layer of the two fetal membranes and is formed from the trophoblast and its lining of mesoderm. From it develop the chorionic villi, which grow into the endometrium and will become the fetal portion of the placenta.
SEE: embryo, SEE: placenta, and SEE: umbilical cord for illus.; SEE: trophoblast
chorionic (kōr″ē-on′ik ), adj.

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Venes, Donald, editor. "Chorion." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767394/all/chorion.
Chorion. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767394/all/chorion. Accessed June 15, 2019.
Chorion. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767394/all/chorion
Chorion [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 June 15]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767394/all/chorion.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - chorion ID - 767394 ED - Venes,Donald, BT - Taber's Medical Dictionary UR - https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/767394/all/chorion PB - F.A. Davis Company ET - 23 DB - Nursing Central DP - Unbound Medicine ER -