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Related to chorionic sac: Chorionic villi, extraembryonic mesoderm


see Sac and FoxSac and Fox,
closely related Native Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). Sac and Fox culture was of the Eastern Woodlands area with some Plains-area traits (see under Natives, North American).
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A soft-walled cavity within a plant or animal, often containing a special fluid and usually having a narrow opening or none at all.
Indentation in the contour lines of equal depth showing submarine relief.


a pouch, bag, or pouchlike part in an animal or plant


1. An early system on the Datatron 200 series.

[Listed in CACM 2(5):16 (May 1959)].
References in periodicals archive ?
A 5- to 8-mm chorionic sac seen earlier than 5 weeks' gestation probably represents inaccurate dating or a shortened follicular phase resulting from earlier ovulation.
Intermediate trophoblasts are located in the villi, the implantation site, and the chorionic sac.
The situation is more complex with identical (monozygotic) twins, however: Most (70%) are monochorionic, but approximately one third (30%) have separate chorionic sacs and are therefore dichorionic.

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