Definition of sinus venosus in US English:

sinus venosus


  • The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.

    • ‘Sino-septal defects refer to those that involve the area of the atrial septum derived from the sinus venosus.’
    • ‘The two entities always go together and it is the de-roofing of the sinus venosus by the anomalous drainage of the right superior pulmonary vein that leads to the sinus venosus ASD.’
    • ‘All the blood from the cardinal veins now drains into the right horn of the sinus venosus.’
    • ‘Diagnostic images of the sinus venosus atrial septal defect usually are not obtainable in most adults.’
    • ‘Communication between the sinus venosus and the primitive atrium, the sinoatrial oriface, is centrally located.’


Early 19th century: modern Latin, literally ‘venous cavity’.


sinus venosus

/ˌsīnəs veˈnōsəs/