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papillary muscle

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.

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Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Papillary muscle is always a great word to know.

So is scapula. Does it mean:

either of two flat, triangular bones, each forming the back part of a shoulder; a shoulder blade

belonging to or lying within a given part of certain muscles or nerves

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American Heritage

Medical Dictionary

papillary muscle n.
Any of the group of myocardial bundles that terminate in the tendinous cords that attach to the cusps of the atrioventricular valves.

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