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latissimus dorsi muscle
The latissimus dorsi () (plural: ''latissimi dorsi''), meaning 'broadest () of the back' (Latin ''latus'' meaning 'broad', ''latissimus'' meaning 'broadest' and ''dorsum'' meaning the back), is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region. ''Latissimi dorsi'' are commonly known as "lats", especially among bodybuilders.
The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction, flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine.
Due to bypassing the scapulothoracic joints and attaching directly to the spine, the actions the latissimi dorsi have on moving the arms can also influence the movement of the scapulae, such as their downward rotation during a pull up.
==Structure==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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