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sinus venosus

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.