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sinus venosus Line breaks: sinus ven|osus
Pronunciation: /viːˈnəʊsəs/

Definition of sinus venosus in English:

noun (plural sinus venosi)

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

Definition of sinus venosus in:
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