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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

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