The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.
- Communication between the sinus venosus and the primitive atrium, the sinoatrial oriface, is centrally located.
- All the blood from the cardinal veins now drains into the right horn of the sinus venosus.
- Sino-septal defects refer to those that involve the area of the atrial septum derived from the sinus venosus.
Early 19th century: modern Latin, literally 'venous cavity'.
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Syllabification: si·nus ve·no·sus
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