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Medical Definition of Sinus venosus
1. 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. Sinus venosus sclerae, the vascular structure encircling the anterior chamber of the eye and through which the aqueous is returned to the blood circulation. Synonym: circular sinus, Fontana's canal, Lauth's canal, Schlemm's canal, sinus circularis, venous sinus of sclera. (05 Mar 2000)
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