Largest opening in the Right atrium
Right Atrioventricular Orifice Blood passes out of the right atrium through the right atrioventricular or tricuspid orifice and goes to the right ventricle. The tricuspid orifice is guarded by the tricuspid valve which maintains unidirectional flow of bloodReference: Vishram Singh Anatomy; 2nd edition; Page no: 265
Superior Venacava
Inferior Venacava
Right Atrioventricular Orfice
Coronary SInus
Thorax