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Definition of Term

chorion
(English) Membrane enclosing the amnion and the yolk-sac, also: an embryonic membrane, elaborated by the follicle cells, which encloses the egg. The eggs of truly viviparous fishes are non-chorionated. Usually hardens on contact with the water; after fertilization the egg secretes fluid and shrinks inward leaving a perivitelline space, May lie external to the zona radiata. (See also: egg, perivitelline, amnion)
chorion
(French) Membrane qui entoure l'amnios et le sac vitellin. (See also: egg, perivitelline, amnion)
corion
(Portuguese) Membrana que contém o amnion e o saco vitelino. (See also: egg, perivitelline, amnion)

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