Papillary muscles (right ventricle, anatomy)

The papillary muscles of the right ventricle comprise:

• anterior papillary muscle:
  • largest
  • originates from right, anterior and lateral ventricular wall
  • merges with the septomarginal trabecula
  • its chordae tendineae insert into anterior and posterior tricuspid valve leaflets
• posterior papillary muscle:
  • second largest
  • arises predominantly from posterior wall
  • occasionally, may exist with the mass of muscle divided into two or three
  • its chordae insert into the septal and posterior leaflets of the valve
• accessory papillary muscles:
  • if present, small and often numerous
  • may arise from the ventricular wall or the septal region of the infundibulum
  • their chordae insert into the anterior and septal leaflets