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( Latissimus dorsi muscle)
The latissimus dorsi (plural latissimi dorsi) is the large, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region. The latissimus dorsi is a triangular, flat muscle, which covers the lumbar region and the lower half of the thoracic region, and is gradually contracted into a narrow fasciculus at its insertion into the humerus. This makes up some of the armpit and stretches down near the gluteus. It arises by tendinous fibers from the spinous processes of the lower six thoracic vertebrae and from the posterior layer of the thoracolumbar fascia, by which it is attached to the spines of the lumbar and sacral vertebræ, to the supraspinal ligament, and to the posterior part of the crest of the ilium. It also arises by muscular fibers from the external lip of the crest of the ilium lateral to the margin of the erector spinae, and from the three or four lower ribs by fleshy digitations, which are interposed between similar processes of the obliquus abdominis externus.
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