A cavity at the caudal end of the embryonic cardiac tube in which the veins from the intra-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: saccus reuniens.
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... from the cellphone, considering we have SA node near our rudamentary sinus venosus inside the heart... This kind of magnetic wave might have disturb the electric impulses ...
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