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Sinus venosus


sinus venosus
1. in lower vertebrates it is the chamber of the heart to which veins return blood. 2. in mammals it is a vessel of the embryonic heart, present in the transverse septum, into which open the vitelline, allantoic, and cardinal veins.
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[L. atrium - hall] In the embryo, it is the chamber of the heart that receives blood from the sinus venosus and delivers blood to the ventricle.
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