It joins the left atrium to the left ventricle .
It has the same general structure of the triscuspid valve, but unlike the latter it has only two cusps:
- anterior or aortic cusp
- posterior cusp (or small cusp) → is quadrangular and smaller than the anterior cusp.
- each flap has an axial and parietal face
- papillary muscles are inserted on the free margin.