Assertion: papillary muscle | /r/HasProperty | extensions of the myocardium
Facets:
Source sentences:
text: The papillary muscles are extensions of the myocardium that pull the cusps together and downward at the onset of ventricular contraction, thus preventing their backward expulsion into the atria.
text: papillary muscle: extension of the myocardium in the ventricles to which the chordae tendineae attach
text: Each is attached to chordae tendineae that extend to the papillary muscles, which are extensions of the myocardium, to prevent the valves from being blown back into the atria.