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Latissimus dorsi
Other Terms:
Lats,
Musculus latissimus dorsi,
Muscle grand dorsal
Muscle parts
None
Latin name
Musculus latissimus dorsi
Latin muscle parts
None
Group
Shoulder joint muscle – intertubercular groove group
Etymology
In English, this muscle’s name means the broadest muscle of the back. The Latin word latissimus is the superlative form of latus, which means “broad or wide;” therefore, the broadest. The Latin term dorsi is the genitive form of dorsum meaning back.
Origin
Spinous processes of the vertebrae from T7 to the sacrum, the posterior iliac crest, and the external surface of the lower three ribs.
Insertion
Floor of the intertubercular groove of the humerus.
Action
Medial rotation, adduction, and extension of the humerus – unlike its close partner, the teres major, the muscle is active during any of these movements whether resisted or not.
Nerve supply
Thoracodorsal nerve (C6, C7, and C8)
Blood supply
Thoracodorsal artery; posterior perforating branches of lower posterior intercostals and upper lumbar arteries.
Latin
Musculus latissimus dorsi
French
Muscle grand dorsal
