papillary muscles (right ventricle, anatomy)
Last reviewed 01/2018
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