The three fibrous triangular components and associated flaps of the tricuspid valve. [ MP:0010622 ]
Synonyms: septal cusp of right atrioventricular valve septal cusp of tricuspid valve cuspis septalis (valva tricuspidalis) septal leaflet of tricuspid valve septal tricuspid leaflet septal leaflet of right-sided tricuspid valve cuspis septalis valvae atrioventricularis dextrae