The sinus venosus is at first situated in the septum transversum (a layer of mesoderm in which the liver and the central tendon of the diaphragm are developed) behind the primitive atrium, and is formed by the union of the vitelline veins.
A ligature placed either around the junction between the sinus venosus and atrium of the frog or turtle heart (first stannius ligature) or around the atrioventricular junction (second stannius ligature); ...
atrium [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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 See also: Lateral, Veins, Tissue, Trans, Segment
  
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