the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
The chorion is one of the membranes that exist during pregnancy between the developing fetus and mother. It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes.
例句与用法
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Impact of mifepristone on the serum and chorion epidermal growth factor and correlation hormone 米非司酮对血清及绒毛组织中表皮生长因子及相关激素的影响
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