The sinus venarum (also known as the sinus of the vena cava, or sinus venarum cavarum [1]) is the portion of the right atrium in the adult human heart [2] where the inner surface [3] of the right atrium is smooth, [2] [3] whereas the rest of the inner surface is rough [3] (trabeculated [2]) due to the presence of pectinate muscles. [4] The sinus venarum represents the portion of the adult heart that develops from the right sinus horn of the [1] foetal sinus venosus. [3] [1] The sinus venarum is demarcated from the rest of the right atrium by the crista terminalis (internally) and the sulcus terminalis (externally). [4]
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