latissimus dorsi (muscle)
Definition: thoracoappendicular muscle (superficial muscle of back); origin, spinous processes of lower five or six thoracic and the lumbar vertebrae, median ridge of sacrum, and outer lip of iliac crest; insertion, with teres major into posterior lip of bicipital groove of humerus; action, adducts arm, rotates it medially, and extends it; nerve supply, thoracodorsal.
Synonym(s): musculus latissimus dorsiTA, broadest muscle of back
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