![papillary muscle papillary muscle](https://www.tekportal.net/wp-content/uploads/2018/12/papillary-muscle.png)
noun Anatomy.
- one of the small bundles of muscles attached to the ventricle walls and to the chordae tendineae that tighten these tendons during ventricular contraction.
n.
- Any of the group of myocardial bundles that terminate in the tendinous cords that attach to the cusps of the atrioventricular valves.