Chorion

Chorion

The cellular, outermost extraembryonic membrane, composed of trophoblast lined with mesoderm. It develops villi about two weeks after fertilization. Villi are the threadlike projections growing in tufts on the external surface of the chorion. At three weeks, it is vascularized by allantoic vessels.

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Part of Speech: noun
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Industry/Domain: Anatomy
Category: Developmental anatomy
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Related terms

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chorion

Anatomy; Developmental anatomy

The cellular, outermost extraembryonic membrane, composed of trophoblast lined with mesoderm. It develops villi about two weeks after fertilization. Villi are the threadlike ...

chorion

Biology; Cell biology

The two-layered structure formed from the trophoblast after implantation; secretes human chorionic gonadotropin.

chorion

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The membrane that develops around an embryo and contributes to the formation of the placenta. Later, as a fetus develops, the chorion fuses with the amnion. See chorionic villi ...

chorion

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The outer covering or shell of the spider or insect egg.

chorion

Agriculture; General agriculture

The outermost extraembryonic membrane surrounding the developing embryo.

trophoblast

Anatomy; Developmental anatomy

A granular protoplasmic body; a plastid, formed from cytotrophoblast, eventually surrounds the entire embryo; insert themselves between uterine epithelial cells, then spread along ...

ventralward

Anatomy; Developmental anatomy

Toward a belly, venter, or ventral aspect.

vertex

Anatomy; Developmental anatomy

The top or crown of the head.

yolk sac

Anatomy; Developmental anatomy

The yolk sac in man contains no nutrients so in this aspect is vestigial. However, the its embryonic endodermal roof is the source of the mucous membrane of almost the entire ...