different between extraembryonic vs chorioallantois

English

From extra- +? embryonic.

extraembryonic (not comparable)

(medicine) Inside the womb, but outside the embryo.
- 1998, Julian Lombardi, Comparative Vertebrate Reproduction,^[1] Springer, ?ISBN, page 237,
  Subsequent cell and tissue interactions lead to the functional differentiation of all embryonic and extraembryonic tissues.

chorioallantois (plural chorioallantoises)

(anatomy) The vascular extraembryonic membrane, formed by the fusion of the allantois and the chorion, that makes up the placenta in most mammals; the chorioallantoic membrane

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