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latissimus dorsi

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la·tis·si·mus dor·si (l-ts-ms dôrs)
n.
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.

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For example, the obliques assist in forming the muscular girdle, and the latissimus dorsi muscle buttresses instability about all 3 orthopedic axes.
With the patient in the sitting position (figure 2), an area 2 cm behind the anterior border of the latissimus dorsi muscle and 4 cm inferior to the tip of the scapula is marked in an attempt to locate the hilus of the vessel.
This forces your latissimus dorsi and connective tissue to stretch as they hold the vertebrae in normal alignment.
 
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