The sinus venarum is the smooth-walled back part of the right atrium that receives the superior and inferior venae cavae. It comes from the embryonic sinus venosus and is separated from the rough, muscle-ridged front part by the crista terminalis.
| Location | Posterior part of the right atrium, between the openings of the venae cavae, behind the crista terminalis |
|---|---|
| Parts |
|
| Nerve Supply | Cardiac plexus |
| Blood Supply | Right coronary artery (atrial branches); Sinoatrial nodal artery |
| Venous drainage |
|
| Lymphatic drainage |
|
Receives systemic venous blood from the venae cavae and passes it into the right atrium proper.
The sinoatrial node sits at the junction of the sinus venarum and the superior vena cava. A sinus venosus atrial septal defect occurs in this area and is often associated with abnormal pulmonary venous drainage.
A defect near the vena cava openings, often with a pulmonary vein draining into the right atrium.
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