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latissimus dorsi

[luh-tis-uh-muh s dawr-sahy] /ləˈtɪs ə məs ˈdɔr saɪ/
noun, plural latissimi dorsi
[luh-tis-uh-mahy dawr-sahy] /ləˈtɪs əˌmaɪ ˈdɔr saɪ/ (Show IPA).
a broad, flat muscle on each side of the midback, the action of which draws the arm backward and downward and rotates the front of the arm toward the body.
Origin of latissimus dorsi
< New Latin: literally, the broadest (muscle) of the back Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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latissimus dorsi in Medicine

latissimus dorsi la·tis·si·mus dor·si (lā-tĭs'ə-məs dôr'sī)
A muscle with origin from the spinous processes of the lower thoracic and lumbar vertebrae, the median ridge of the sacrum, and the outer lip of the iliac crest, with insertion into the humerus, with nerve supply from the thoracodorsal nerve, and whose action adducts the arm, rotates it medially, and extends it.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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