The cusps of the heart valves serve to seal the heart valves when closed. There are normally three cusps for each valve except the mitral valve (hence its alternate name, “bicuspid valve”.)

“Nodules” are located at the tip of the valve, to form a tighter seal.

• pulmonary valve^[1]
  • “right cusp”
  • “left cusp”
  • “anterior cusp”

• aortic valve^[2]. (Note that one is absent in the condition bicuspid aortic valve.)
  • “right cusp”
  • “left cusp”
  • “posterior cusp” (or “noncoronary cusp”)

• tricuspid valve
  • “anterior cusp” (or “infundibular cusp”)
  • “posterior cusp” (or “marginal cusp”)
  • “septal cusp” (or “medial cusp”)

• mitral valve
  • “anterior cusp”
  • “posterior cusp”

• Template:SUNYAnatomyFigs – “Valves of the heart.”