Any of the conical bundles of muscle found in the ventricles of the heart which terminate in the chordae tendineae attached to the atrioventricular valves.
Origin
Late 18th century.
Definition of papillary muscle in US English:
papillary muscle
noun
Anatomy
Any of the conical bundles of muscle found in the ventricles of the heart which terminate in the chordae tendineae attached to the atrioventricular valves.