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Definition: a cavity at the caudal end of the embryonic cardiac tube in which the veins from the intraembryonic and extraembryonic circulatory arcs unite; in the course of development, it forms the portion of the right atrium known in adult anatomy as the sinus of the vena cava.
Synonym(s): saccus reuniens
Examples: glitazone, GI cocktail, etc.
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